第1个回答 2012-10-21
1,Is this your son?Yes,he is./No,he isn't.
2,Is that his sister?Yes,she is./No,she isn't.
3,Is she your good friend?Yes,she is./No,she isn't.
4,Are these nice pictures?Yes,they are./No,they aren't.
5,Is this a middle school?Yes,it is,/No,it isn't.本回答被网友采纳