回答如下：
陈述句改成一般疑问句时，要把助动词(do，will，have，be等)、情态动词(can，should，may，need，must等)、be动词(系动词，也可以作助动词)、have动词(表示“有”，也可以作助动词)放在主语的前面。一般疑问句句子结构如下：
助动词、情态动词、be动词、have(有) + 主语 + 谓语 +其他。例如：
1. He works hard.
改成一般疑问句：
Does he work hard? (行为动词work要用动词原形)
2. He can swim.
改成一般疑问句：
Can he swim? (主语后面跟动词原形)
3. We are students.
改成一般疑问句/
Are you students? (系动词be要随着主语人称而变化)
4. He has a car of his own.
改成一般疑问句：
(英国英语) Has he a car of his own?
(美国英语) Does he have a car of his owr?
5. He was arrested by the police this morning. (was是助动词)
改成一般疑问句：
Was he arrested by the police this morning?
6. We have been to Beijing. (have是助动词)
改成一般疑问句：
Have you been to Beijing?
7. We are climbing the mountain now. (are是助动词)
改成一般疑问句：
Are you climbing the mountain now?
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