CAN

Can for permission
Affirmative (+) | Negative (-) | Yes/No Questions (?) | Short Answers
I / You / He / She / It / We / They can go to the mountains. | I / You / He / She / It / We / They can’t go to the mountains. | Can I / you / he / she / it / we / they come to the mountains? | I / you / he / she / it / we they can. No, I / you / he / she / it / we / they can’t.

THERE WAS / THERE WERE

There was/were: Yes/No Questions and Short Answers
Affirmative (+) | Negative (-) | Questions (?) | Affirmative Short Answers (+) | Negative Short Answers (-)
There was a snake in the grass. | There wasn’t a snake in the grass. | Was there a snake? | Yes, there was. | No, there wasn’t.
There were many cars on the street. | There weren’t many cars. | Were there many cars? | Yes, there were. | No, there weren’t.

PAST SIMPLE WITH IRREGULAR VERBS

Infinitive | Affirmative (+) | Negative (–)
go | I went to the swimming pool. | I didn’t go to the park.
have | You had dark hair. | You didn’t have blonde hair.
read | He read the book last year. | He didn’t read the book.
say | Annie said, ‘Good luck!’ | Annie didn’t say a thing.
see | We saw Jenna’s parents there. | We didn’t see her parents.
take | They took some food with them. | They didn’t take food with them.