句型转换。（5分）
小题1:Whose guitar is this? (改为同义句)
_________ _________ the guitar belong to?
小题2:Jack used to be an outgoing pianist. ( 改为一般疑问句)
_________ Jack _________ to be an outgoing pianist?
小题3:Jennifer is worried because of her poor English. (对划线部分提问)
_________ __________ Jennifer worried?
小题4:Your brother has never heard of the story, __________ ____________? (完成反意疑问句)
小题5:I think parents should be strict with teenagers. ( 改为否定句)
I_______ ________ parents should be strict with teenagers.