例: That is an apple.

Those are apples.

That is a bird.

例: I am going to study (study) Physics.

例:她不能看见和听见。

 She couldn't see or hear.

 Model: I want to buy （buy）a dictionary.

Model: It looks good.

It doesn't look good.

 Model:  She is eating dinner.（eat）

 Model:  run    runs   running

①swim   

②hop   

③cut