一般现在时的构成以及各种句式
我们首先来看看一般现在时的构成。一般现在时的构成：
a. be动词过去式的句式。
否定句是在was/were后面加not，was not (wasn't)/were not (weren't)。一般疑问句是把was / were提前并放到句首，要求首字母要大写。
b.实义动词过去式的句式。
①肯定式：主语+动词过去式+其它。
如：They had a good time yesterday.
②否定式：主语+did not(didn't)+动词原形+其它。
如：They didn't watch TV last night.
③一般疑问句：Did+主语+动词原形+其它？
肯定回答：Yes，主语+did.否定回答：No，主语+didn't.
如：Did they have a meeting two days ago? Yes，they did. / No，they didn't.
④特殊疑问句：特殊疑问词+did+主语+动词原形+其它？
如：What time did you finish your homework?
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