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I want to eat chips.

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I noticed that he had played his phone for two hours.

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I am writing.

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Penghui is looking at me.

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1. Describe what is in progress or around the present time.
ex. I am doing my homework./ My mother is washing the dishes.
2. Describe temporary events or changing situations.
ex. I am learning to be a psychologist./ I am reading the book from my roommate.
3. Describe things that happen in the future.
ex. I am flying to New York next week.
4. Repeat action.
ex. John is always coming late.

Related website
http://www.englishpage.com/verbpage/presentcontinuous.html
http://www.englisch-hilfen.de/en/grammar/pres_pro.htm

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1. The coordinating conjunction and, but, or, so, and yet connect independent clauses.
ex. I don't eat meat, but I eat fish.
Connecting sentences with and, but, and or.
2. you can use the comma before the next sentence you want to connect.
ex. The restaurant sold burger, but it did not sell wings.
3. When you connect sentences with the same subject with and or or, you can omit the subject. Also, if the modals or the auxiliary verbs are the same, you can omit the modals or auxiliaries.
ex1. We drank at the bar last week, and we really liked it.
we drank at the bar last week and really liked it.
ex2. Mike can go with us, or she can meet us at the apartment.
Mike can go with us or meet us at the apartment.
4, Do not to use but start an article in academic writing.
5. Use and to connect an independent clause which will adds information.
ex. He is an excellent waiter, and I love his service.
6. But can introduce opposite or surprising information.
ex. This is supposed to be a good school, but my friends don't like it.
7. Or can introduce a choice or an option. you can use it in question with modals of possibility.
ex. we could go to Mcdonald's, or we could go to bread garden market.
Connecting sentences with so and yet.
8. So can introduce the result.
ex. I don't like the burger, so I always order the sandwich.
9. Use yet can express contrast meaning, sometimes stronger than but.
ex. Mary doesn't drink beer, yet she drinks vodka.

Relative website
http://www.chompchomp.com/terms/coordinatingconjunction.htm

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The color of fire alarm is red.

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An infinitive is to + the base form of verb. Some main verbs in a sentence are followed by an infinitive, not a gerund.
A. verbs + Infinitives
ex. We decide to go to gym after class./
B. verbs + objects + infinitives
1. After some verbs, an object comes before the infinitive. The object performs the action of the infinitive. The following verbs are followed by an object + infinitive.
ex. He wants me to go to supermarket with him.
2. Some verbs can be followed by either an object + infinitive or an infinitive only.
ex. I chose Peter to teach me piano. / Let me help you to finish this homework.

Related websites
http://www.chompchomp.com/terms/infinitive.htm
http://www.ef.com/english-resources/english-grammar/infinitive/

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1. It depends on how certain you feel about something
ex. It shouldn't be easy to finish the data homework./ The class might not be good to you.
2. Use can't or couldn't when you are almost certain something is not likely or not possible.
ex. I can't use my laptop right now. / He couldn't be working recently.
3. Use have to and must (not) when you are mostly certain or when you think there is only one logical conclusion.
ex. He has to know his responsibility. / You must worry about your future.
4. Use ought to and should (not) when you have an expectation based on experience or evidence.
ex. You shouldn't miss the bus. / They should be free to go class.
5. Use could, may (not), and might (not) when you are unsure or when you don't have much evidence.
ex. I might not go to class today because I feel uncomfortable. /I could have a pet after I graduate.

Related websites
http://speakspeak.com/english-grammar-   exercises/intermediate/intermediate-grammar-exercise-modal-verbs-for-present-probability-must-cant-could-may-might
http://www.perfect-english-grammar.com/modal-verbs-of-probability.html

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1. Describe a completed event that happened before another event in the past.
ex. They had been worked for couple years./ Tom had been graduated for three years.
2. Describe an event in a time period that leads up to another past event or time period. Use the simple past to describe the later event or time period.
ex. They found that the key had been remade for one year. / He realized that his sister had studied biology.
3. The prepositions can introduce the later time period.
ex. They  had known about the grade before teacher told them. / She had lost her key before her mom came home.
4. The past perfect is often used to give reasons or background information for later past events.
ex. She had missed the exam because she was late. / Before she went to school, she had eaten the breakfast at home.

Related websites:
http://www.englishpage.com/verbpage/pastperfect.html
http://www.ef.com/english-resources/english-grammar/past-perfect-tense/

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1. Describe general facts and permanent situations.
ex. The sun rises in the  east. / One day has 24 hours.
2. Describe routines and habits and routines.
ex. I work from Monday to Friday. / We go to school five days a week.
3. Describe scheduled events, and timetables.
ex. Today I wake up at 8 a.m./ Our class starts at 7:30.

related website
http://www.englishpage.com/verbpage/simplepresent.html
https://www.grammarly.com/blog/simple-present/