Were they very happy yesterday?（作否定回答）

they were very happy yesterday.变为一般疑问句和否定句怎么变? Were they cheap?作否定回答 were they beautiful?作否定回答 Were they in youe bag just now?(作否定回答） ____,they___. All the students were very happy 变为否定句、一般疑问句、做肯、否定回答 We were very happy to hear from our tercher改为一般疑问句 肯定回答 否定回答 They were at work at that time.（改为否定句和一般疑问句并作肯否定回答） were you happy yesterday?这个怎么回答 they were very happy怎么变感叹句 Are you and your parents happy?(作否定回答） Did Sarah play football yesterday?(作否定回答） Was he in beiJing yesterday?（作否定回答）