他的工作是?英语翻译what is his jib?为什么句中的is不用does?

他的工作是?英语翻译what is his jib?为什么句中的is不用does? Where does his father work?句中的does为什么不用is? what does it mean?为什么用does而不用is What is he waiting for?为什么用is不用does when is his birthday? 句子开头为什么不用what? 为什么What is your parents' job?中的parent是复数却不用are而用is? 小学英语中What is his hobby?的同一句是-----------? what time does the shcool begin?为什么用does而不用is? 英语翻译是“What does this sing mean?”为什么不是“What is this sing mean What is most important?此句中的most前不用加the吗?如果是What is the impor What is his job?的同义句 what is your mother hobby?为什么不用Does而是用Is?