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句子的种类 1．英语中按使用目的或功用分为四类：陈述句、疑问句、祈使句、感叹句。 A．陈述句。 ○1 陈述句说明一个事实或陈述一个人的看法。陈述句分为肯定陈述句和否定陈述句两种。 a．陈述句的肯定式。I have already posted the photos. / They are students. / I must go now . / He was reading a book at 8:00 last night. b．陈述句的否定形式。 （1）谓语动词是系动词be, 助动词have, will, shall, be或情态动词，只须在其后面加not构成否定句。 She isn't a student . / He hasn't been to the Great Wall . / I can not swim . / You will not go there tomorrow. / They aren't sleeping . （2）若谓语动词是实义动词，在实义动词前加上do not，第三人称单数现在时用does not，过去时用did not。 He didn't send me an invitation . （3）由具有否定含义的词never, nobody, hardly, little, dislike, seldom, few, too