1. It is time you decided what to prepare for the party (It is time + S + V_ed/2: đã đến lúc làm gì)

2. I will never talk to him again unless he apologizes for his rudeness (Unless = If not; If1: If + S + V(s,es), S + will + V(inf); apologize (to s.one) for s.th/doing s.th: xin lỗi (ai) về việc gì/làm gì)

3. The last time I have played football was in 1998 (The last time S +V_ed/2 + was + mốc thời gian: lần cuối ai đó làm gì là vào ....)

4. Exercise which is taken regularly improves the fitness of our body and our mind (ĐTQH "which" dùng để chỉ vật)

5. The room is so dirty that it needs cleaning (so adj that: quá... mà; Bị động: need + V_ing/to be Vp.p)