如题所述
1、一般现在时,第三人称单数要加s。如:
He always (usually) does his homework after dinner.
2、一般过去时,即使有usually,always等,也不用加s,而是用过去式。如:
He always (usually) did his work after dinner last year.
3、如果前面有情态动词,如can,will,would,may,can,could,should,might,must,need等,或是不定式(动词前加to)的,就不用加s。如:
He can always do his homework by himself.
He will usually do his homework after dinner.
扩展资料
第三人称单数加s规则
1、一般的在单词后加s;
2、名词以s,x,ch,sh结尾的要加es;
3、名词以o结尾的,表示有生命的,要加es,无生命的要加s,例如hero(英雄),加es,photo (照片)加s;
4、名词以辅音字母加y结尾的,要把y变i加es;
5、还有很多特殊变化的词,如woman-women,foot-feet,man-men;
6、还有一些单复数一样的单词,deer-deer;
7、还有一些只以复数意义出现的单词,如people。
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