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1) I went to the mountains last winter.

2) It was my birthday yesterday.

3) My brother was on holiday autumn last year.

1 did I went to the mountains last winter?

2 was it my birthday yesterday?

3 was my brother on holiday autumn last year?

1 I didn't go to the mountains last winter.

2 it was not my birthday yesterday.

3 my brother wasn't on holiday autumn last year.