1) Could you warn me about it
2) He had to miss the morning train.
3) You should think well this time.
4) You can come here anytime.
5) Last year I lived close to the university. I didn’t have to get up early.
6) You must have read this book.
7) They will be able to help us.
8) We were unable to enter the house because we did not have a key.
9) I have to speak at this conference.
