第三人称单词后的s是怎么加的？
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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