1/ Why don't we plant more trees in the garden?
→
 I suggest planting more trees in the garden

_ suggest V-ing
2/ Finish your homework or you will be punished by your teacher.
→
 If you don't finish your homework , you will be punished by your teacher

_ If 1: If S + V hiện tại , S will V
3/ Hung doesn't have free time so he can't play soccer.
→
 If Hung had free time , he could play soccer.

_ If 2 : If S + V quá khứ , S would V
4/ Why don't you collect waste paper to raise money, Lan?
→
 I suggest that Lan should collect waste paper to raise money

_ S suggest that S should V

5/ She is a careful truck driver.
→
 She drives truck carefully .

_ S + V + adv