三单在什么情况下
\u4ec0\u4e48\u65f6\u5019\u7528\u5355\u4e09\u5355\u4e09\uff0c\u5373\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\uff0c\u6ce8\u610f\u4e24\u70b9\uff1a\u4e00\u662f\u201c\u7b2c\u4e09\u201d\uff0c\u6307\u7684\u662f\u9664\u4e86\u201c\u6211\uff08\u4eec\uff09\u201d\uff08I,we\uff09\u548c\u201d\u4f60\uff08\u4eec\uff09\u201c\uff08you\uff09\u4e4b\u5916\u7684\u4eba\u79f0\uff1b\u5355\u6570\uff0c\u6307\u7684\u662f\u201d\u4e00\u4e2a\u201c\uff0c\u7efc\u5408\u4e24\u70b9\uff0c\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u5c31\u662f\u6307\u9664\u4e86\u6211/\u6211\u4eec\uff0c\u4f60/\u4f60\u4eec\u4e4b\u5916\u7684\u8868\u793a\u4e00\u4e2a\u6570\u91cf\u7684\u4eba\u79f0\uff0c\u6bd4\u5982he,she,it,Tom,Lily\u7b49\u3002
\u5f53\u4ee5\u4e0a\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u4f5c\u4e3b\u8bed\u7684\u65f6\u5019\uff0c\u76f8\u5e94\u7684\u8c13\u8bed\u52a8\u8bcd\u8981\u7528\u7b2c\u4e09\u4eba\u79f0\u5355\u6570\u5f62\u5f0f\uff0c\u5e38\u89c4\u7684\u53d8\u5316\u662f\u5728\u52a8\u8bcd\u8bcd\u5c3e\u52a0-s/-es\uff0c\u4f8b\uff1aThey work in a hospital./ He works in a hospital.(\u540e\u8005\u5c31\u56e0\u4e3a\u662fhe\u4f5c\u4e3b\u8bed\uff0c\u6545work\u52a0\u4e86\u4e2as)
she\u5c31\u662f\u5355\u4e09 \u3002\u3002\u3002
以下几种情况可以使用动词单三形式：1.第三人称单数he she it 做主语
2.非谓语动词(动词不定式，动名词)做主语
3。再就是比如时间，长度等作主语时当作单数来用
ten years has passed
一般是在动词后面加S或加ES,例如 You father usually reads book."read"变成了"reads".当然这局限于所要修饰的是第三人称.例如 they he she it.还有提问时"拆开来",写成助动词加动词原形,例如 What does your father usually do?
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