陳述句變為一般疑問句

1。當句子謂語是單個實義動詞時，直接在句首加Do， do的時態和主句實義謂語動詞一致，Do的單復和主語一致。

The red sun rises in the east。

Does the sun rise in the east？

He asked her to take it out。

Did he ask her to take it out？

2。當句子謂語為Be、包含be、為Be的完成時態have/has時，直接將（am/is/are/was/were/have/has）其放在句首即可

The boy was travelling on the motorbike。

Was the boy travelling on the motorbike？

There is a restaurant around the corner。

Is there a restaurant around the corner。

They have carried out the plan successfully。

Have they carried out the plan successfully。

3。當句子的謂語是情態動詞+Be/do時，情態動詞放句首即可

They shall help you。

Shall they help you？

They should help you。

Should they help you？

It can be a great success。

Can it be a great success。