一個(gè)完整而正確的句子里只能有一個(gè)謂語(yǔ)，另一個(gè)或其他個(gè)動(dòng)詞就要變換形式成為非謂語(yǔ)動(dòng)詞。

I like playing football.

（like是謂語(yǔ)，playing是非謂語(yǔ)動(dòng)詞）

非謂語(yǔ)動(dòng)詞有三種形式：to do、doing 、done

to do表將來(lái)，表目的

I want to go fishing.

To get a great grade I try my best.

doing表進(jìn)行表主動(dòng)

I am reading books.

I saw a girl standing here.

done表完成，表被動(dòng)

I have done my homework.

Enjoying music makes me feel relaxed.