英语在什么情况下动词后面需要加s?，什么情况下不用加？ 什么情况动词加s，什么情况动词不加s？
\u82f1\u8bed\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b\u52a8\u8bcd\u540e\u9762\u9700\u8981\u52a0s?\uff0c\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4e0d\u7528\u52a0\uff1f\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u4ee3\u8bcd\u6216\u8005\u5355\u6570\u540d\u8bcd\u65f6\uff0c\u540e\u9762\u7684\u52a8\u8bcd\u53d8\u6210\u5355\u6570\u5f62\u5f0f\uff0c\u52a0s\u3002
\u89c4\u5219\uff1a
\u5f53\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0she\u3001 he\u3001it\u6216\u540d\u8bcd\u65f6\uff0c\u8c13\u8bed\u52a8\u8bcd\u8981\u7528\u5355\u6570\u5f62\u5f0f\u3002
\u52a8\u8bcd\u5355\u6570\u5f62\u5f0f\uff1a
1\u3001\u52a8\u8bcd\u4ee5ch\u3001sh\u3001o\u3001s\u3001x\u7ed3\u5c3e\u65f6\uff0c\u5355\u6570\u5f62\u5f0f\u8981\u52a0es\u3002
2\u3001\u52a8\u8bcd\u4ee5\u5143\u97f3\u5b57\u6bcd+y\u7ed3\u5c3e\u65f6\uff0c\u5355\u6570\u5f62\u5f0f\u662f\u5728y\u540e\u76f4\u63a5\u52a0s\u5143\u97f3\u5b57\u6bcda\u3001e\u3001i\u3001o\u3001u\u3002
3\u3001\u52a8\u8bcd\u4ee5\u8f85\u97f3\u5b57\u6bcd+y\u7ed3\u5c3e\u65f6\uff0c\u5355\u6570\u5f62\u5f0f\u662f\u628ay\u53d8\u6210i\u518d\u52a0es\u8f85\u97f3\u5b57\u6bcd\u662f26\u4e2a\u5b57\u6bcd\u4e2d\u9664\u53bb\u5143\u97f3\u5b57\u6bcd\u3002
4\u3001\u9664\u53bb\u4ee5\u4e0a\u4e09\u79cd\u60c5\u51b5\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u52a8\u8bcd\u7684\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u5f62\u5f0f\u90fd\u662f\u76f4\u63a5\u52a0s\u3002
5\u3001be\u52a8\u8bcd\u5305\u62ecam\u3001is\u3001 are\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u8981\u7528is\u3002
6\u3001have\u7684\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u662fhas\u3002
\u6269\u5c55\u8d44\u6599\u7b2c\u4e00\u4eba\u79f0\u5c31\u662f\u201c\u6211\u201d\u548c\u201c\u6211\u4eec\u201d\u3002\u7b2c\u4e8c\u4eba\u79f0\u662f\u201c\u4f60\u201d\u548c\u201c\u4f60\u4eec\u201d\u3002\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u662f\u201c\u4ed6\u201d\u3001\u201c\u5979\u201d\u548c\u201c\u5b83\u201d\uff0c\u590d\u6570\u5219\u662f\u201c\u4ed6\u4eec\u201d\u3001\u201c\u5979\u4eec\u201d\u548c\u201c\u5b83\u4eec\u201d\u3002
\u67d0\u4e00\u53e5\u8bdd\u4e2d\uff0c\u8a00\u8bed\u53d1\u51fa\u65b9\uff08\u7b2c\u4e00\u4eba\u79f0\uff09\u548c\u8a00\u8bed\u7684\u542c\u53d7\u65b9\uff08\u7b2c\u4e8c\u4eba\u79f0\uff09\u4ee5\u5916\u7684\u5176\u5b83\u4eba\u79f0\u3002\u5355\u6570\u662f\u6307\u8be5\u53e5\u4e2d\u63d0\u5230\u7684\u5176\u5b83\u4eba\u662f\u4e00\u4e2a\u4eba\uff0c\u76f8\u5bf9\u4e8e\u4e24\u4e2a\u4eba\uff08\u53cc\u6570\uff0c\u5728\u592a\u5e73\u6d0b\u5c9b\u5c7f\u571f\u8457\u8bed\u8a00\u4e2d\u5e7f\u6cdb\u5b58\u5728\u4eba\u79f0\u4ee3\u8bcd\u7684\u53cc\u6570\uff09\u6216\u66f4\u591a\u4eba\uff08\u590d\u6570\uff09\u3002\u5982\u6c49\u8bed\u4e2d\u7684\u201c\u4ed6\u201d\u201c\u5979\u201d\u201c\u5b83\u201d\uff0c\u82f1\u8bed\u4e2d\u7684he\she\it\him\her\u3002
\u5728\u4e00\u822c\u73b0\u5728\u65f6\u4e2d,\u5f53\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u65f6,\u5b83\u540e\u9762\u7684\u8c13\u8bed\u52a8\u8bcd\u5f97\u52a0s.
\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u6709:he,she,it,\u5355\u4e2a\u4eba\u540d/\u7269\u540d,\u5f62\u5bb9\u8bcd\u6027\u7269\u4e3b\u4ee3\u8bcd+\u5355\u6570\u540d\u8bcd,
our
english
teacher
has
two
sons.
their
room
is
very
big.
在现在时中，当动词是句中（包括主句、从句）的谓语动词时，为保持主谓一致，往往当主语是第三人称（他，她，它，他们，别人……）单数（除去多个人或物之外）形式的时候，需要变为三单形式。其变化有一定规律：
大部分动词变为三单形式时，可以直接加s：
make-makes set-sets
以o，s，ch，sh，x结尾的动词需要加es：
search- searches
wash-washes
go-goes guess-guesses
以辅音加y结尾的动词需要把y去掉后加ies：
study-studies
注意：以元音加Y结尾的动词，由于元音和外构成的是元音短语，与辅音加y结构有所不同，不可以把元音和y割裂，需要直接加s：
play-plays enjoy-enjoys
还有一些特殊变形：
have-has be-is
除了开头所描述的情境之外，动词是不需要变为三单的。
例如：
当动词做非谓语时：
I had tried something to make him stop crying, but nothing worked.
当时态不是现在时时：
She made（直接变换时态） up her mind to live here.
当句子中有助动词时：
She doesn't teach English.
当句子中有情态动词时：
She will tell you later.
希望我的回答能对你有所帮助!
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