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一、陈述句改为一般疑问句：
1.当句子中含有be动词(am is are was were)或情态动词(can, could, may, should等）时，把be动
词或情态动词提到句首。

如：①He is a docter.-----Is he a docter? ②They were in the house yesterday.----Were they in……?
另外，为符合实际习惯
I am/We are..…------Are you…? I was/We were…-----Were you….?
I /We can…-----Can you…..?
2.当句中含有实义动词时，也就是句子不含上面所提到那些be 动词或情态动词时，必须在句首
加DO/Does/Did,具体情况分以下三方面：
㈠当句子中含有动词原型时，在句子前加Do, 其中，I + 动词。

------Do you…?
如：①I like music.---Do you like music? ②They work here.----Do they work here?
㈡当句子中含有的动词加S或es时，即句子是一般现在时，且主语为第三人称单数时，在句子前加Does.如：①He likes music.------Does he like music?
②Tom comes from China.-----Does Tom come from China?
（注意在此情况下，应把疑问句中的动词变原型。

）
㈢当句子中的动词为过去式，在句子前加Did再把动词变原型。

如：
I went to the park yesterday.-----Did you go to the….?
He played football this morning.-----Did he play……?
二、陈述句改为否定句：
1.当句子中含有be动词(am is are was were)或情态动词(can, could , should等），在be动词或情
态动词后加not.如：
①He is a docter. ----He is not a docter.
②They were in the house yesterday.---They were not in……
③Tom can swim.-----Tom can not swim.
2.当句中含有实义动词时，也就是句子不含上面所提到的be动词或情态动词时，必须在原句动词
前加don’t,或doesn ’t或didn’t：
㈠当句子中含有动词原型时，在动词前加don’t：
如：I like music,-----I don’t like music. They go to school by bike.-----They don’t go to……
㈡当句子中含有的动词加s或es时，即句子是一般现在时，且主语为第三人称单数时，在句子中的动词前加doesn ‘t，再把动词变原型:
如：He likes music.-----He doesn’t like music.
Tom works here----- Tom doesn’t work here.
㈢当句子中的动词为过去式，在动词前加didn’t，再把动词变原型
如：I went to the park yesterday.------I didn’t go to……….
He played football this morning ------He didn’t play football…….
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