Are his keys under the book?一般疑问句就是Are, Is,Do, Does, Will等开头,具体看主语这里的主语是HIS KEYS,复数,所以将后面的are提前就好He works in the company. 变成Does he work in the company? Work是动词,并且he是单数,所以用doesThey work in the company. Do they work in the company? they 是复数你自己再好好研究一下,很简单的...