1a) It doesnt happen yesterday.

b) It was pasta week.

2a) He doesnt care about us.

b) He cared about us when we failed.

3a) I couldnt stop him.

b) She stopped studying.

4a) I didnt learned it.

b) She learned how to do this.

5a) I didnt listened the music yesterday.

b) But she did it, she listened it a few days ago.