Question

1) Peter (to do) morning exercises.

2) Her sisters (to walk) with their dog.

3)We (to be) friends.

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Answer 1

1) Peter does morning exercises.  + 
Peter doesn't morning exercises. - 
Does Peter do morning exercises? 

2) Her sisters walk with their dog. +
Her sisters don't walk with their dog - 
Do her sisters walk with their dog?

3)We are friends. + 
We aren't  friends. - 
Are we friends ?