1) peter (to do) morning exercises. 2) her sisters (to walk) with their dog. 3)we (to be) friends. поставить предложения в утверд., отриц. и вопрос. формы настоящего времени

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 ?