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陳述句變一般疑問句的方法

用yes或no來回答的疑問句，一般疑問句用升調。陳述句變為疑問句時分三種情況：

1. 陳述句中有系動詞be、助動詞be, have / has, do, will, would, shall, should, had或情態動詞can, could, may, might, must, dare, need, ought時，將這些系動詞、助動詞或情態動詞移到句首，并在句末加上問號。如：

I’ll go to the History Museum this afternoon. — Will you go to the History Museum this afternoon?  今天下午你去了歷史博物館嗎？

I visited Beijing last month. — Did you visit Beijing last month? 上個月你參觀了北京嗎？

在對疑問句進行回答時，須注意：

(1) 當回答could, would所提的問題時，一般用can, will. 如：

—Could you help me with my homework this evening? —Yes, I can. / No, I can’t.

—Would you go there right now? —Yes, I will. / No, I won’t.

在對方向你表示邀請時，可用OK, sorry等來替代Yes，No.

(2) 在對用may所提問題的否定回答時，一般用mustn’t / can’t；而在對用 must所提的問題進行否定回答時，一般用needn’t / don’t have to. 如：

—May I use your bike now? —Yes, you may. / No, you can’t. (mustn’t)

—Must I stay at school this afternoon? —Yes, you must. / No, you needn’t (don’t have to).

2. 原陳述中沒有系動詞be、助動詞be, have / has, do, will, would, shall, should had或情態動詞can, could, may, might, must, dare, need, ought時，則在句首加助動詞Do的適當形式，同時，將謂語動詞變為原形動詞。如：

We speak Chinese. — Do you speak Chinese? 你講漢語嗎？

I went shopping yesterday. —Did you go shopping yesterday? 昨天你去買東西了嗎？

3. 原陳述句中，若謂語動詞是have / has, 則須考慮have / has的意義。如果have / has是“有”的意義時，變為疑問句時，既可在句首加Do的適當形式，也可將have / has,提到句首。如：

He has a beautiful pen. —Has he a beautiful pen? / does he have a beautiful pen? 他有一只漂亮的鋼筆嗎？

但若have / has,的意思不是“有”時，變為疑問句時，則必須在句手加Do的適當形式。如

I have lunch at home. —Do you have lunch at home? 你在家吃中飯嗎？

We had a meeting last night. —Did you have a meeting last night?  昨天晚上你開會了嗎？

(4) 原陳述句中有情態動詞used to時，它的一般疑問句，可將used移到句首；也可在句首加Did 。如(from m.52ysedu.com)：

I used to go swimming in the river. —Did you use to go swimming in the river? / Used you to go swimming in the river? 你過去常常去那條河里游泳嗎？

(5) 當心need, dare兩個動詞。這兩個動詞既可以做情態動詞又可以做行為動詞。做情態動詞時，直接將它們移到句首。此時，若用need的問句，肯定回答時用must，否定回答時，用needn’t。若作行為動詞，則用Do的適當的形式提問。如：

—Need I come here tomorrow?—Yes, you must. / No, you needn’t.

—I need to go to school now. —Do you need to go to school now?

—Dare you tell your father about it?

—Do you dare to go out at night?