将下列句子改为疑问句,并作肯定回答和否定回答 1.This is Gina.2.That is his brother.

Is this Gina?Yes,she is.No,she isn't.
Is that his brother?Yes,he is .No,he isn't.
Is he your good friend?Yes,he is.No,he isn't.
Are these nice pictures?Yes,they are.No,they aren't.
Are those school things?Yes,they are.No,they aren't.