Đảo ngữ câu điều kiện loại 3:

-Had + S + PII, S + would/could/... + have + PII + ....

-Had it not been for/If it hadn't been for/But for + N, S + would/could/... + have + PII +....: Nếu không nhờ cái gì thì đã...

This is my mother, she is a nurse.

Which class are you in?

How many rooms does your house have?

How many people are there in your family?

Where is your house?

What time is it?