1.this is gina.
一般疑问句：Is this Gina?
肯定回答：Yes,it is.
否定回答：No,it isn't.
（以下按此顺序回答）
2.that is his brother.
Is that his brother?
Yes,it is.
No,it isn't.
3.he is my good friend.
Is he your good friend?
Yes,he is.
No,he isn't.
4.these are nice pictures.
Are these nice pictures?
Yes,they are.
No,they aren't.
5.those are school things.
Are those school things?
Yes,they are.
No,they aren't.