英语什么情况加S?满意的重赏80分！
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当主语是单数第3人称时,动词加s比如He reads book.
当动词以s,es,th,sh,o结尾时，动词应加es
比如He goes too fast.
当句子是现在进行时时,动词加ing
如：He is reading book.
第三人称单数后面动词要加s,动词结尾是ch,sh,x,s的时候加es，比如
"reach"就加es变为"reaches"。还有一些不规则的动词，就不一一列举了。
例句：
I read a book.
He reads a book. 就是这个区别。
在be动词后面要加ing，还有一些其它的规律。
例句：
I am reading.
He is reading.这时候第三人称单数没有区别。
其它的一些规律：
I see a boy reading a book.
I finish reading the book.
I like reading.
第三人称一般现在时用S吧
es一般ch,sh,x,s是以es作名词复数，动词的话要根据动词最后音调判断，如果是辅音一般不用，如果是助音用es不过也有例外的～
ing形式是动词变动名词用
Ex:He likes reading.
或者现在时使用
EX:He was reading the book when i came in.
动词+S/ES:在主语是第三人称单数的情况下
动词+ing: 1:在进行时态中 be+Ving
2:做名词用时 常出现于介词后
可数名词单数变复数--------终结版
可数名词分单数复数。复数是由单数变来的。变化规则如下：
1.一般来说，词尾+s, desk----desks friend --------friends
2.以s, x, sh, ch结尾，+es, bus --------buses box------boxes fish-----fishes watch---watches
3.以辅音字母+y结尾， 变y为i,再加es. baby-----babies family------families
4.以o结尾的，有生命的，+es,黑人英雄爱吃西红柿和土豆。negro/hero/ potato/tomato+es
无生命的，+s, piano/ radio/ zoo/ photo +s.
5.以f,fe结尾的，变f,fe为v再加es。妻子拿刀去宰狼，小偷吓得发了慌。
躲在架后保己命，半片树叶遮目光。
涉及 wife, knife, wolf, thief, shelf, self, life,half, leaf.这九个以f,fe结尾的词，均变f,fe为v再加es。
6.有一些不规则变化：man----men foot----feet mouse-------mice老鼠 child---children
sheep----sheep
名词的复数加s
例：apple——apples
但是复数的形式也有很多种，
例：cake——cakes，
像是e结尾的，就直接加s，
还有是y结尾的，而且y字母前面是辅音，就去y加ies
例：baby——babies
但是像toy的复数形式就是toys，因为o是元音。
复数形式还有最后一种，就是单复数同行（单数形式和复数形式一样）
例：fish——fish deer——deer
以s,sh,ch,x结尾的单词要加es。
例：dish——dishes
1部分名词复数形式，如：parents，apples，bananas......
2第三人称后的谓语动词，如： he says,he talks to sb that....
一般就这两种
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