Question

раскройте скобки , заменяя инфинитив нужной формой глагола -сказуемого 1"When you (to have) breakfast yesterday ?" 2"I (to have) breakfast at nine in the morning"

Answer 1

When did you have breakfast yesterday? (окончание не надо т.к. это вопрос) 

I had breakfast at nine in the morning. 

Answer 2

When did you have breakfast yesterday? I had breakfast at nine in the morning