把下列句子变成一般疑问句,并作肯定回答和否定回答。答:Yes,we do./No,we don't.3.Is this a cat?Yes,it is./No,it isn't 4.Can he ride a bike?Yes,he can ./No,he can't 5.Are you a teacher?Yes,I am ./No,I am not.6.Is mother goat reading a newspsper?Yes,she is./No,she isn't 7.Does his mother have a toy ...