当主语是第三人称单数时，后面的动词要加S吗 主语是三单时，后面的动词为什么要加S ？？
\u5f53\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u65f6\uff0c\u540e\u9762\u7684\u52a8\u8bcd\u8981\u52a0S\u5417\uff1f\u52a0
\u5728 \u4e00\u822c\u73b0\u5728\u65f6\u7684\u65f6\u6001\u4e0b\uff0c\u5f53\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u65f6\uff0c\u540e\u9762\u7684\u52a8\u8bcd\u8981\u52a0S
\u4e0d\u662f\u6240\u6709\u7684\u90fd\u52a0s
(1)\u4e00\u822c\u52a8\u8bcd\u5728\u8bcd\u5c3e\u52a0-s\uff0c-s\u5728\u6e05\u8f85\u97f3\u540e\u8bfb\uff0fs\uff0f\uff0c\u5728\u6d4a\u8f85\u97f3\u6216\u5143\u97f3\u540e\u8bfb\uff0fz\uff0fds\u8bfb\uff0fdz\uff0f\uff0cts\u8bfb\uff0fts\uff0f\u3002\u5982\uff1a
help\u2192helps\uff0fhelps\uff0f\uff0cknow\u2192knows\uff0fnEuz\uff0f\uff0cget\u2192gets\uff0fgets\uff0f\uff0cread\u2192reads\uff0fri:dz\uff0f
(2)\u4ee5\u5b57\u6bcds\uff0cx\uff0cch\uff0csh\u6216\u6709\u4e9b\u4ee5o\u7ed3\u5c3e\u7684\u52a8\u8bcd\u52a0-es\uff0c-es\u8bfb\uff0fiz\uff0f\u3002\u5982\uff1a
guess\u2192guesses\uff0f'gAsiz\uff0f\uff0cfix\u2192fixes\uff0f'fiksiz\uff0f\uff0cteach\u2192teaches\uff0f'ti:tFiz\uff0f\uff0cwash\u2192washes\uff0f'wRFiz\uff0f
\u6ce8\u610f\uff1ago\u2192goes\uff0fgEuz\uff0f\uff0cdo\u2192does\uff0fdQz\uff0f
(3)\u4ee5\u8f85\u97f3\u5b57\u6bcd+y\u7ed3\u5c3e\u7684\u52a8\u8bcd\uff0c\u5148\u53d8y\u4e3ai\uff0c\u518d\u52a0-es\uff0c-ies\u8bfb\uff0fiz\uff0f\u3002\u5982\uff1a
carry\u2192carries\uff0f'kAriz\uff0f\uff0cfly\u2192flies\uff0fflaiz\uff0f
\u6ce8\uff1a\u5728play\u2192plays\uff0fpleiz\uff0f\uff0csay\u2192says\uff0fsez\uff0f\u4e2d\uff0c\u5b57\u6bcdy\u524d\u4e3a\u5143\u97f3\u5b57\u6bcd\uff0c\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u5f62\u5f0f\u76f4\u63a5\u5728\u52a8\u8bcd\u540e\u9762\u52a0-s\u3002
(4)\u7279\u6b8a\u8bcd\u4f8b\u5916\u3002\u5982\uff1a
be\u2192is\uff0chave\u2192has
\u5f53\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u65f6,\u5982\u679c\u662f\u4e00\u822c\u73b0\u5728\u662f\uff0c\u52a8\u8bcd\u662f\u8981\u52a0s,es,\u4ee5\u5143\u97f3\u5b57\u6bcd\u7ed3\u5c3e\u7684\uff0cy\u53d8i\u518d\u52a0es\uff0c\u5426\u5b9a\u53e5\u548c\u7591\u95ee\u53e5\u4e0d\u52a0\uff0c\u7528\u52a8\u8bcd\u539f\u5f62\u3002
1\u3001\u5982\u679c\u662f\u4e00\u822c\u73b0\u5728\u65f6\uff0c\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\uff0c\u8c13\u8bed\u52a8\u8bcd\u7528\u5355\u4e09\u5f62\u5f0f\uff08do-does\u3001walk-walks\uff09
2\u3001\u5982\u679c\u662f\u4e00\u822c\u73b0\u5728\u5b8c\u6210\u65f6\uff0c\u4e3b\u8bed\u662f\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\uff0c\u52a9\u52a8\u8bcd\u7528\u5355\u4e09\u5f62\u5f0f\uff08have-has\uff09
3\u3001\u5176\u4ed6\u65f6\u6001\u4e2d\uff0c\u4e3b\u8bed\u662f\u5355\u6570\uff0c\u8c13\u8bed\u52a8\u8bcd\u7528\u5355\u6570\uff08\u7279\u522b\u662fbe\u52a8\u8bcd\uff0c\u6bd4\u5982was\uff09
\u6269\u5c55\u8d44\u6599\u4e0d\u662f\u6240\u6709\u7684\u90fd\u52a0s
(1)\u4e00\u822c\u52a8\u8bcd\u5728\u8bcd\u5c3e\u52a0-s\uff0c-s\u5728\u6e05\u8f85\u97f3\u540e\u8bfb\uff0fs\uff0f\uff0c\u5728\u6d4a\u8f85\u97f3\u6216\u5143\u97f3\u540e\u8bfb\uff0fz\uff0fds\u8bfb\uff0fdz\uff0f\uff0cts\u8bfb\uff0fts\uff0f\u3002\u5982\uff1a
help\u2192helps\uff0fhelps\uff0f\uff0cknow\u2192knows\uff0fnEuz\uff0f\uff0cget\u2192gets\uff0fgets\uff0f\uff0cread\u2192reads\uff0fri:dz\uff0f
(2)\u4ee5\u5b57\u6bcds\uff0cx\uff0cch\uff0csh\u6216\u6709\u4e9b\u4ee5o\u7ed3\u5c3e\u7684\u52a8\u8bcd\u52a0-es\uff0c-es\u8bfb\uff0fiz\uff0f\u3002\u5982\uff1a
guess\u2192guesses\uff0f'gAsiz\uff0f\uff0cfix\u2192fixes\uff0f'fiksiz\uff0f\uff0cteach\u2192teaches\uff0f'ti:tFiz\uff0f\uff0cwash\u2192washes\uff0f'wRFiz\uff0f
\u6ce8\u610f\uff1ago\u2192goes\uff0fgEuz\uff0f\uff0cdo\u2192does\uff0fdQz\uff0f
(3)\u4ee5\u8f85\u97f3\u5b57\u6bcd+y\u7ed3\u5c3e\u7684\u52a8\u8bcd\uff0c\u5148\u53d8y\u4e3ai\uff0c\u518d\u52a0-es\uff0c-ies\u8bfb\uff0fiz\uff0f\u3002\u5982\uff1a
carry\u2192carries\uff0f'kAriz\uff0f\uff0cfly\u2192flies\uff0fflaiz\uff0f
\u6ce8\uff1a\u5728play\u2192plays\uff0fpleiz\uff0f\uff0csay\u2192says\uff0fsez\uff0f\u4e2d\uff0c\u5b57\u6bcdy\u524d\u4e3a\u5143\u97f3\u5b57\u6bcd\uff0c\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u5f62\u5f0f\u76f4\u63a5\u5728\u52a8\u8bcd\u540e\u9762\u52a0-s\u3002
(4)\u7279\u6b8a\u8bcd\u4f8b\u5916\u3002\u5982\uff1a
be\u2192is\uff0chave\u2192has
当主语是第三人称单数时,如果是一般现在是，动词是要加s,es,以元音字母结尾的，y变i再加es，否定句和疑问句不加，用动词原形。
1、如果是一般现在时，主语是第三人称单数，谓语动词用单三形式（do-does、walk-walks）
2、如果是一般现在完成时，主语是第三人称单数，助动词用单三形式（have-has）
3、其他时态中，主语是单数，谓语动词用单数（特别是be动词，比如was）
扩展资料
不是所有的都加s
(1)一般动词在词尾加-s，-s在清辅音后读／s／，在浊辅音或元音后读／z／ds读／dz／，ts读／ts／。如：
help→helps／helps／，know→knows／nEuz／，get→gets／gets／，read→reads／ri:dz／
(2)以字母s，x，ch，sh或有些以o结尾的动词加-es，-es读／iz／。如：
guess→guesses／'gAsiz／，fix→fixes／'fiksiz／，teach→teaches／'ti:tFiz／，wash→washes／'wRFiz／
注意：go→goes／gEuz／，do→does／dQz／
(3)以辅音字母+y结尾的动词，先变y为i，再加-es，-ies读／iz／。如：
carry→carries／'kAriz／，fly→flies／flaiz／
注：在play→plays／pleiz／，say→says／sez／中，字母y前为元音字母，第三人称单数形式直接在动词后面加-s。
(4)特殊词例外。如：
be→is，have→has
具体还要看句子所表述的时态,如果是一般现在时,要加s或es,具体要看谓语动词是什么.
否定句和疑问句不加，用动词原形
在一般现在时中主语是第三人称单数的人称代词he，she，it或者和它们功能相当的名词作为主语时，谓语动词变化为单三形式，即动词词尾加-s或者-es。
He goes to school from Monday to Friday.
Mary always washes his hands before dinner.
如果后面动词作谓语 且为一般现在时或现在完成时 动词或助动词要加S
比如：She has good taste in art. 她对艺术有很好的品味 （一般式）
She has made it clear. 她已经搞清楚了 （完成时）
以上仅为动词have的变化 英语中的动词有规则变化动词和不规则变化动词 have 是不规则变化动词 而你说的加s是规则变化的动词 当然了 有时是加es的
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