1. I met my friend yesterday. I didn't meet my friend yestrday. Did I meet my friend yesterday?
2. The children found an apple last week. The children didn't find an apple last week. Did children find an apple last week?
3. We decided to go to the zoo. We didn't decide to go to the zoo. Did we decide to go to the zoo?
Мяу на английском языке это mew
а междометие meow
1) If I am here I will help you.
If I was here I would help you.
If I had been here, I would have helped you.
2) If it is possible we will begin this work at once.
If it was possible we would begin this work at once.
If it had been possible, we would have begun this work at once.
3) If she has all the necessary books she will make her report in time.
If she had all the necessary books she would make her report in time.
If she had had all the necessary books, she would have made her report in time.