英语句中的开头部分什么时候用动词的原型，什么时候用动名词，什么时候用过去分词？ 什么时候用现在分词什么时候用动名词什么时候用过去分词？
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\u8fc7\u53bb\u5206\u8bcd\u653e\u5728\u53e5\u9996\u8868\u793a\u52a8\u4f5c\u662f\u88ab\u52a8Praised by the neighbours,he became the pride of his parents.\u6216\u8005Given more time,I'll be able to do it better.\u6216\u8005Once seen,it can never be forgotten.
\u52a8\u540d\u8bcd\u653e\u5728\u53e5\u9996\u8868\u793a\u628a\u52a8\u8bcd\u540d\u8bcd\u5316Eating no junk food is a good habit.
\u52a8\u8bcd\u539f\u5f62\u653e\u5728\u53e5\u9996\u7684\u53e5\u5b50\u4e3a\u7948\u4f7f\u53e5Sit down,please.
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楼主，您好1）原型 祈使句 就是有命令的语句如：Close the door please2）当主语被省略时就用动词ing，如：Getting used to getting up early3）（when sth be）Compared with 。。。如：Compared with this cat，it is better than that谢谢采纳！最佳答案
动名词和现在分词虽然形式一样,但从本身词性来说，动名词顾名思义，属名词词性，所以在句中要充当名词能作的成分，常作主语/宾语/定语/表语.
现在分词(表主动/进行),属形容词词性,充当形容词能作的成分,常作表语/定语/状语/补语.
所以可以从-ing形式作的成分来确定它是动名词还是现在分词.如果-ing形式是作主语/宾语的,那肯定就是动名词了.如果是作状语/补语,那肯定是现在分词.
至于动名词和现在分词都可以作的成分定语/表语,需要具体去区别.
(1)作定语时的区别:
现在分词表示主动/进行,作定语时表示与被修饰词是主动关系.
动名词作定语时表示被修饰词的用途.
举个例子：
a swimming girl “一个正在游泳的女孩”(现在分词）
a swimming pool “一个游泳池”(动名词）
(2)作表语时两者的区别：
动名词作表语时,主语和表语的位置可以互换.
eg: My job is teaching.
= Teaching is my job.
现在分词作表语,通常是指那些已经转化为形容词的-ing形式,如interesting, exciting, disapointing,surprising等.
eg: The book is interesting.
为什么要强调说 “那些已经转化为形容词的-ing形式”呢？因为大多数情况下，常见的 “be + 现在分词”是用来构成进行时的，不看作是系表结构。
eg: She is doing her homework
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