제가 지금 basic grammar in use  책을 혼자 보고 있는데요

 

I was doing 과 I did

과거진행형과 과거 시제 하구 있는데

 

이해가 안가는게 있어서요 꼭좀 답변부탁드립니다

 

주어진 동사의 과거 또는 과거진행형을 쓰시오.

 

A:Was Megan at work today?

B:No. she              didn't go         (not/go)  to work. She was sick.

 

A:How fast were you driving when the police. stopped you?

B:I don't know exactly, but I                  wasn't driving          (not / drive) very fast.

 

A:Did your team win the baseball game yesterday?

B:No , the weather was very bad, so we                 didn't  paly          (not / play)

 

go , drive , paly 다 동사입니다.  왜 첫번째는 didn't 인거고

 

두번째 는 왜 wasn't 구

 

세번째는  왜 didn't 인겁니까?  정말 이해가 안가요 ㅠㅠ 세 단어 모두동사인데 왜그런지

 

친절히좀 알려주세요 !