1. susan maybe knows the address
MAY / MIGHT+ BE + V (có thể làm gì)
2. Joanna mightn’t have received my message.
Phỏng đoán trong quá khứ: might (not) have + V_ed/PP
3. I was able to finish all my work
S + be (chia) + able to + V : Ai đó có thể làm gì
4. Nancy didn't need to clean the flat
S + need + to V (nguyên) + O
5. You had better sit down
S + had better + Verb (nguyên mẫu)+…
Bổ sung câu
The report has to be on my desk tomorrow
Subject + have to + Verb (infinitive).