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there are several advantages does effective device possess, which are greater convenience than hand writings 

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Over the previous three decades, there have been noticeable changes in languages and communication styles of Chinese. Firstly, due to the rapid development for (dev...s in) information technology, there are a variety (SVA) of methods for communication, such as sending e-mails, making a video call and applying for (delete?) other social applications. On the contrary (In contrast), Chinese generally wrote letters and texted(??) others to convey information in the past 30 years (thirty years previously) because of the limitation (???did they exist??) for devices. Additionally, the communication language in the past was dramatically discriminate (???) from that for this age.(What does this sentence mean??) The language was always simple?? and traditional before while various types of languages (new features), for example, emoji and acronyms, are relatively common in Chinese modern society because of the pursuit for convenience as well as the rapid pace of life.   KF

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Since the world has transited (?)for several decades, there are (vf) enormous advancements which impel local living standard such as food and drinks in China. ???Firstly,  the most noticeable change is the style of eating. Before (delete) 30 years ago, food or meat cannot purchase (verb form) without rice tickets, which is separated by community(???) and obtained in limited quantity. It is (now???) common to see porridge as a whole day staple food in a common family. When the local living standard generally become (vf) better, most of (delete) exotic food can be see (vf) in ordinary family.  Secondly,    KF

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Over the past three decades, there has been significant changes in language and communication style in China. To begin with, as for the form of language, the dialects were much more commonly used in communicating rather than mM andarin in thirty years ago. However, an increasing number of Chinese currently  prefer to speak mandarin in recent years which shows a trend to use the same language. The dialects vary according to the  different hometown of speakers.    KF

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Over the previous three decades, there have been noticeable changes in  language and communications style in China. Firstly, a dialect was often spoken in the family, however, (Revise punctuation and connectors - see the pink handout)  m Mandarin is usually heard at home.  Furthermore,  letters were generally written as the best means of communication between those living apart from each other, which and often takes(vt) several days to reach the addressee, while currently immediate mobile and visual communication make connection more convenient and faster.   KF

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Over the previous three decades, there have been noticeable changes in leisure activities (sp) in China. Firstly, whether it is 30 years ago or now, watching movies has always been the popular form of entertainment for most young Chinese. Nevertheless, today, not only the theme of films has become more varied, creative and appealing,but the prices of movies also have become (have also become) much  more affordable for everyone. For instance, while the science fiction films cannot (could not) be shot and projected on the screen with 3D or 4D technology before 30 years ago, which  is extremely common in the movie market  now.(incomplete sentence) This means, the selectivity and the view experience have improved for viewers. Secondly, most of the young's favourite music and dance style has (styles of the young have) changed. In the past, the young enjoy (vt)playing (?) disco to relax with their friends, which is tend (verb form) to Hongkong style, but  the rock music and Hip-hop are popular for the young today. It may be  influenced by western countries.  KF

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Over the previous thirty years, there have been considerable changes in language and communication style. In the past, Individuals who lived in different locations were often found it hard to communicate because of the limited channels ???. To be more exact, writing a letter was the only ?? main tool for them to expressed (verb form) their words. Further, it was detrimental for some urgent circumstances. In marked contrast comparison with the inefficient way, in recent years, many can chose various application (s) to communicate with others immediately rather than waiting for a long time. In addition, with the modernization, a growing number of foreigners and international organizations migrated (vt)to China due to the convenient transportation, which caused that many cultures and languages have flowed into China. ??Some might argue that cultural diversity would pose a threat to indigenous cultures. ???English , however, has became (vf) a crucial part in teenagers' courses. in schools curricula.  In conclusion,

those changes to traditional culture

made a significant contribution to having some complete effects ???in Chinese's language and communication style.  KF

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Over the previous thirty years, there have been noticeable changes in food in China. In the past, Chinese use (vt) food coupons to buy productions (ww) they need (vt).  the amount of supply was assigned according to numbers of  (the number of family members family which means each  person is provided (vt)with absolutely equal food. It This was due to the implement (wf)of planning economy in this special period that  when food trade was limited and little choices were offered. After the transformation from planned economy to market economy, nowadays    KF

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Over the previous three decades, there have been noticeable changes in leisure activities in my country China. Due to advanced technology, the communication style have completely different between three decades.???? leisure??
First of all, the language (???leisure??) which speak in daily life has been changed. In recent year, teenagers or young people only know how to speak Mandarin and English because of education policy. Taiwanese or some other aboriginal languages are much less speaker to use.

Sandy, I don't understand.  This paragraph should be all about leisure.  Try again and email me on gmail.  Karen

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Over the past three decades, there have been noticeable changes in food and drinks in China. Firstly,  food coupons was (SVA) necessary to get food from the shop thirty years ago.  However, this limitation has been abandoned so that it is currently  much  more convenient to pay for the food from the market  in cash or credit cards now. Furthermore, the types of drinks have increased rapidly over the previous three decades. In the past, tea was the main drink of most Chinese. In contrast, there are a variety of beverages could be chosen in the supermarkets such as coke and coffee. In addition,  there  are  have been significant changes in the habits of meals eating habits. Thirty years ago,  most Chinese were accustomed to cooking by themselves in daily life. It is This was mainly because of the planned economy which limits (vf)the establishment of private restaurants. On the contrary, In contrast,  today the choices of meals are varied because of  the well developed catering services which benefits from the formulation ??of market economy. In conclusion, great changes have happened to the food and drinks in China in the past thirty years.   KF

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Over  the previous three decades, there have been noticeable changes in leisure activities in China. One obvious difference is that reading newspapers or listening to the radio is (vt) the single approach main form of for recreation when Chinese stay (vt) at home in the past. Various media, however, have emerged are currently used, making daily entertainment ways more diverse. For example, citizens can enjoy free films on the Internet or watching live video streaming with their smartphones rather than only face (???)newspapers and radios. In addition, a growing number of Chinese tourists may commonly choose to take a vacation overseas at present , which was one of the most incredible leisure activities  quite a rare leisure activity before 30 years.thirty years previously.  Specifically, This was mainly due to the limitation of transportation and the lack of great roads,and  even travelling to a neighboring province for a journey is very difficult. As a consequence, these significant changes may have improved Chinese satisfaction with recreational approaches. ?? KF

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Leisure activities in China have changed thoroughly (have thoroughly changed)over the past three decades. Firstly, the youth in the 1980s enjoyed disco while the young are currently fond of contemporary and modern dance. It is interesting to note that some believe those some of those who love (vt) disco in the past now gradually fall in love with square dance (dancing). Additionally, children (who) lived 30 years ago were often doing some outdoor activities such as running, swimming, or kicking a ball. In contrast, children of the day (these days) are (often) addicted to the screen during their leisure time; , not only to mobile phone games but also the computer. Another significant difference is the mass media. The clunky and old-fashion radio has now transformed into new forms of media such as Internet media including some videos and real-time comment.  KF

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The public has witnessed there have been many changes in communication methods among Chinese in the previous three decades.  Many new communication methods have been developed. Citizens could transfer message in more forms faster now. For instance,  birthday greetings may be sent  by birthday cards which needs several days  for the delivery process and the cards were easy to lost. In contrast, users could use a modern method to send their greetings now.The messages would be received instantly by the receivers. Media or voice could also be included in the messages through advanced technology  now. Modern messages may be also more easy to preserve by modern cloud drive. Users could just save messages using some internet messages will be preserved in online documents forever. In addition, the developed technology allows
users today to keep in touch in a very convenient method with a quite low cost. The mobile phones could provide mobile communicate service  for users in nearly every place as long as the signal is available. Users who travel abroad  could communicate with their relations at any time instead of consuming too much time on sending and receiving letters. There are many differences in the method of communication which have deep influence on the public's life. The public is more convenient to communicate with their relations now due to the invention of new technology.

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Over the previous three decades, there have been noticeable changes in leisure???? you don't write about lesisure ...you write about food????activities in China. Before three decades, Thirty years ago, the  most Chinese could offer food coupons to exchange food. Food coupons as a currency at that time,and  if a person wants (vt)to gain??? some cereal, they need (vt) to use it ??them??. However, the Chinese government public (verb???) a new edict in October 1992. Citizens could spend cash to acquire food in modern life. In addition, their leisure activities also have changed.??? see your topic sentence???  Everyone would join an outdoor movie which is (vt)very cheap. At that time, toiler ??? labourers did not have much entertainment, the outdoor movie became a popular activity for them. In contrast, as  with the development of technology, the citizen (only one????)would like to often choose the cinema when they want to watch movies.      KF

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Over the previous three decades, there have been noticeable changes in language and communication style in China. Firstly, with the rapid development of electronic technology,  most Chinese tend to use Wechat, e-mail and other smartphone applications to communicate with their friends in recent years these days. In contrast, hand-written letters and the fax were more popular thirty years ago.  Another significant difference is the popularity of m Mandarin. In the past, residents in different areas, especially in southern part(s) of China, used to speak their own dialect which could not be understood easily by others. The rate of speaking mandarin in China now, however, is much higher than the one thirty years ago. This means that an increasing number of Chinese may prefer to speak mandarin rather than the dialect in their daily life.  KF

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Over the previous three decades,there have been noticeable changes in the communication style of Chinese.  Firstly,  the communication style was (vt)more inconvenient ??? adjective???in the past, meaning that citizens were(vt) often almost delivered sent letters with  to relatives and friends to maintain the relationship. However, following the development of electronic technology, the current communication system is much more developed than it was 30 years ago. For example, there are several advantages on effectively electronic devices ,which are  greater convenient than hand writings such as sending e-mails,(pl) WeChat and texting messages et al. As a result these changes can reduce the time consuming even save the outlays of delivering letters. ???  KF

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Great changes have taken place in China previous and nowadays. over the previous three decades. There is an obvious difference in Chinese eating habits. First of all, although many Chinese are still willing to eat traditional food everyday, there is no denying that the number of them receiving the consumption of fast food is increasing higher today. Restaurants with other national flavors have become  more universal (widespread??) in China. In addition, most of Chinese could only attain food through limited food stamps 30 years ago, whereas almost all kinds of food can be purchased in contemporary Chinese supermarkets. They which are no longer regulated by the government to buy a limited variety of food.In contrast, Chinese residents have more right to can choose what they really desire or need.   KF

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Over the previous three decades, there have been noticeable changes in language and communication skills. Large The large majority of the population in China only speak (vt) a dialect or mMandarin 30 years ago, while the number of individuals who can speak multiple languages is increasing recently.  currently higher.  Furthermore, English has become a required class in China for these three decades. difference??
Communication skills could also be another change. In terms of ???the huge economical  (ww)development in China, smartphone has commonly been is the most  important tool for communication today .However, letter (writing a letter) was more popular in China 30 thirty years before.    KF