1: S + have to + V: Ai đó phải làm gì đó:

+ I have to do my homework for the next lesson

+ She has to water the flowers every day

+ Nam has to learn English to communicate with his cousins

+ They have to answer the questions on Hoidap247 if they want to get amazing gifts

+ We have to do these projects until night

2.1: S + give up + V_ing: Ai đó từ bỏ việc gì đó:

+ I has given up smoking for 3 years

+ She gives up doing this homework because it is too difficult

+ He gave up playing online games 3 days ago

2.2: S + give up + N: Ai đó từ bỏ cái gì đó:

+ They give up tennis because they don't have time for it

+ She has given up fat food because she doesn't want to be a fat person

+ We gave up the works at the company to become a volunteer

3: S + be + able to + V: Ai đó có khả năng/có thể làm gì đó:

+ I am able to swim when I was 6

+ Ask him about that problem, he might be able to help you

+ I was able to finish it this afternoon

I have to finish homework

He give up smoking

I'm able to become a doctor in the future