II

1.I enjoy playing tennis with my friends every weekend. ( enjoy + Ving) 

2.What were you doing this time yesterday? ( QKTD ) 

III
1. A bufflow ploughs better than a horse. ( ss hơn của trạng từ) 

2.Last night, we were having dinner when the phone rang. (QKTD,QKĐ)

IV

1.Dogs can swim better than cats. ( ss hơn của trạng từ ) 

2. Minh really enjoys haing out with friends ( enjoy+ving) 

3. It is very interesting to play beach games. ( it is + adv + toV)

4.He spends all his free time looking after his garden. ( S + spend(s) + time + Ving )

5. Do you mind changing this T-shirt for me?  (mind + Ving) 
Chúc bạn học tốt !