1 His hobby is collecting coinsin his free time( sau hobby dùng tobe+v-ing)

2 Don't forget to wash your hands more regularly to avoid catching  viruses( công thức Don't forget +to V .....)

3 He wants to visit the docor , because he has a terrible headache ( Câu sử dụng so->câu sử dụng because)

4 We have done volunteer work for 2 weeks ( có công thức S+started+V-ing+O+ time => S+have/has+PII+O+since/for+time)

5 Last week,we provided some food anh clothe in the people in the Centre of VietNam (hoán đổi vị trí các từ mà không đổi nghĩa )

1. His hobby is collecting coins in his free time.

His hobby is… – Sở thích của anh ấy là…
2. Don't forget to wash......
 Don't forget + to V_infinitive dùng để nhắc nhở đừng quên làm một việc gì đó
3. He wants to visit the doctor because he has a terrible headache
4. We have done volunteer work for 2 weeks