1.My brother is not good at playing tennis. 

→My brother doesn't play tennis well

2.Stop talking or you won’t understand the lesson. 

→If you stop talking, you will understand the lesson

3.I’ll be on vacation next week, so I won’t be able to attend the meeting. 

→Since I'll be on vacation next week, i won't able to attend the meeting

4.Let’s use banana leaves to wrap food.?

→What about using bananas leaves to wrap food?

5.You should have your hair cut.

→I suggest you should have your hair cut

1.My brother doesn't play tennis well

2. If you don't stop talking, you won't understand the lesson

3. Since I'll be on vacation next week, I won't able to attend the meeting.

4. What about using banana leaves to wrap food.

5. I suggest you ( should) have your hair cut.

Chúc bn hc tốt !