什么时候是动词不定式做主语，什么时候是动词原形做主语，什么时候是动词ing做主语？ 英语中句子开头什么时候用动名词做主语，什么时候用动词不定式做...
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\u4f8b\u5982\uff1aopen the door
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A:
1\u3001\u52a8\u540d\u8bcd\u505a\u4e3b\u8bed\u5f80\u5f80\u8868\u793a\u666e\u901a\u7684\u3001\u4e00\u822c\u7684\u884c\u4e3a\uff0c\u4e0d\u5b9a\u5f0f\u505a\u4e3b\u8bed\u5e38\u8868\u793a\u67d0\u6b21\u5177\u4f53\u7684\u884c\u4e3a\u3002\u4f8b\u5982\uff1a
Collecting information about children\u2019s health is his job. \u6536\u96c6\u6709\u5173\u513f\u7ae5\u5065\u5eb7\u7684\u4fe1\u606f\u662f\u4ed6\u7684\u5de5\u4f5c\u3002
It\u2019s necessary to discuss the problem with an experienced teacher. \u4e0e\u4e00\u4f4d\u6709\u7ecf\u9a8c\u7684\u8001\u5e08\u8ba8\u8bba\u8fd9\u4e2a\u95ee\u9898\u662f\u6709\u5fc5\u8981\u7684\u3002
2\u3001\u5e38\u7528\u4e0d\u5b9a\u5f0f\u505a\u4e3b\u8bed\u7684\u53e5\u578b\u6709\uff1a
\uff081\uff09It\u2019s difficult (important, necessary) for sb. to do
\uff082\uff09It\u2019s kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb. to do.
3\u3001\u5e38\u7528\u52a8\u540d\u8bcd\u505a\u4e3b\u8bed\u7684\u53e5\u578b\u6709\uff1a
It\u2019s no good (use, fun) doing.
It\u2019s (a) waste of time one\u2019s doing.
ps\uff1a\u201ccollecting the information about childrens health\u201d\u53ea\u662f\u6682\u65f6\u884c\u4e3a\uff0c\u53c8\u4e0d\u662f\u4e00\u76f4\u90fd\u5728\u6536\u96c6\u3002
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doing
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to
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doing\u8868\u793a
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\u7948\u4f7f\u53e5\u7684\u53e5\u578b\u5f88\u597d\u8bb0\u7684\u54af
\u6bd4\u5982Close
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classroom
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A:
1、动名词做主语往往表示普通的、一般的行为，不定式做主语常表示某次具体的行为。例如：
Collecting information about children’s health is his job. 收集有关儿童健康的信息是他的工作。
It’s necessary to discuss the problem with an experienced teacher. 与一位有经验的老师讨论这个问题是有必要的。
2、常用不定式做主语的句型有：
（1）It’s difficult (important, necessary) for sb. to do
（2）It’s kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb. to do.
3、常用动名词做主语的句型有：
It’s no good (use, fun) doing.
It’s (a) waste of time one’s doing.
ps：“collecting the information about childrens health”只是暂时行为，又不是一直都在收集。 一般没有动词原形做主语的
为了什么的时候用TO DO 原型不能做主语 祈使句是把主语省略了 LET'S GO 省略了WILL YOU 主语 是you动名词作主语用ING 主语+谓语+宾语+宾补主语宾语一般式名词 用定语修饰谓语是动词 或BE 状语修饰谓语 状语可以是副词 副词可修饰形容词BE后面的叫表语 汉语里没表语 表语是名词或形容词语都有从句 谓语没从句
表目的用动词不定式祈使句用动词原形主语是动作 做事时用动词ing
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