改疑问句,英语
陈述句变疑问句,可分为两种：
变为一般疑问句：将原句中或原句对应的助动词、be动词或情态动词提前到句首.例如：
Tom is a top student.——Is Tom a top student?
He worked hard at his lessons.——Did he work hard at his lessons?
We should believe in ourselves.——Should we believe in ourselves?
变为特殊疑问句,要加所需要对应意义的特殊疑问词.例如：
They arrived here 【yesterday】.——When did they arrive here?
【They 】arrived here——Who arrived here yesterday?
They 【arrived 】here yesterday.——What happened to them yesterday?
They arrived 【here】 yesterday.——Where did they arrive yesterday?