把下列句子改成否定句.

This isn't my brother。It isn't his book。He isn't sad。He doesn't hasvea bag。They don't like red。Neither Mary nor Amy are sisters。I don't have breakfast every morning。Mary doesln't ikesmath。That isn't my brother。I am not happy。She doesn't have two sisters。His favorite teacher isn't Miss Li。Tom doesn't get up at seven。They don't go to school everyday。They aren't families。Mr Smith isn't my art teacher。