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一般現(xiàn)在時(shí)的句子結(jié)構(gòu)
1、當(dāng)句子表狀態(tài)說明主語是什么或怎么樣時(shí),其句型：主+BE動(dòng)詞（am,is,are）+表語,否定式是在BE動(dòng)詞后加not,疑問句是將BE動(dòng)詞提前到句首（即在主語之前）
e.g.The twin sisters are from America.這對(duì)孿生姐妹是美國(guó)人.
The twin sisters are not from America.
Are the twins from America?
2、當(dāng)謂語由實(shí)義動(dòng)詞充當(dāng),主語不是第三人稱單數(shù)時(shí),
句子結(jié)構(gòu)為：主語+動(dòng)詞原形+其它
否定式為：主語+don't+動(dòng)詞原形+其它
疑問句為：Do+主語+動(dòng)詞原形+其它?
e.g.We speak Chinese.
Do you speak Chinese?
They don't speak Chinese.
當(dāng)主語是第三人稱單數(shù)時(shí)：
句子結(jié)構(gòu)為 主語+動(dòng)詞（詞尾加s或es）+其它.
否定式為：主語+doesn't+動(dòng)詞原形+其它.
疑問句式：Does+主語+動(dòng)詞原形+其它?
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