· Present Simple +   if  +    Present Simple
+ EXAMPLES:
· if you freeze water , it turns into ice.

·  If children study, then their parents are happy

· If you mix red and blue, you get purple.

· If I run, I get tired
· ice becomes water if it melts
+ ENLACE:
https://www.lewolang.com/gramatica-inglesa/ejercicios/64/zero-conditional
+ AUDIO:

· if  +  present simple  + (,) comma  +   will or modals: may / might/ could + verb

· will or modals: may / might/ could + verb + if +  present simple
+ EXAMPLES
· if i go to the movies, i will have fun with my friends

· i will have fun with my friends if i go to the movies
· if he tells the truth, they will forgive him
· if you find a mistake, i will correct it

· if everyone agrees we can go on a trip
+ENLACE: https://www.lewolang.com/gramatica-inglesa/ejercicios/68/first-conditional 
+ AUDIO:

· could  +  verb in infinitive form (without to)  +  if + past tense
+EXAMPLES:
· if i had a boyfriend, i would be happier

· i could fly if i got wings

· If I won the lottery, I would travel everywhere.

· If I were in Japan, I would go to Tokyio.

·If I had more money, I would buy an apartment.
+ ENLACE: https://www.lewolang.com/gramatica-inglesa/ejercicios/100/second-conditional 
+ AUDIO:

· modal  + have + past participle  +  if  +   past perfect    

 · if  +  past perfect  + comma  +  modal  + have + past participle 

·  had + past participle
+ EXAMPLES:
· if he hadn´t been late, he wouldn´t have lost his job

· i might not have danced on the table if i hadn´t been drunk

·if they had studied, they  could not have failed the exam

· if she had been there, i would have seen her.

·if i had studied more, i would have passed the exam.
+ ENLACE:
https://www.lewolang.com/gramatica-inglesa/ejercicios/105/third-conditional
+ AUDIO: