1. I am glad to see my old friends again after a long time. (cấu trúc S + be + adj + to V)
2. He may be sick because he did'nt go to the class this morning (sau may + V)
3. My  father didn't let me go to school alone when I was small (Kể về kỉ niệm => chia QKĐ, let sb + V)
4. We did the test well although it was difficult (sau V là 1 trạng từ)
5. You should take an umbrella because it is raining heavily now (Sau V là 1 trjang từ)
6. It took me half an hour to repair the bike yesterday (cấu trúc take + sb + to V, chia thì QKĐ)
7. She spends an hour a day studying English. (cấu trúc spend + V-ing)