作业帮动词作主语要变成动名词,或是动词不定式.什么时候可以和动词不定式互换,什么时候不能换?
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/04/28 20:04:42
动词作主语要变成动名词,或是动词不定式.什么时候可以和动词不定式互换,什么时候不能换?
就是V+ing,to do 作主语时可以互换么?在句首.要详细点的,最好举例说明.哪些能换,哪些不能换.
就是V+ing,to do 作主语时可以互换么?在句首.要详细点的,最好举例说明.哪些能换,哪些不能换.
相同点：
1.不定式短语和动名词做主语时,常常为了保持句子的平衡,用it来做形式主语,如：
It is not easy to learn English well.It is no use asking him for help.
2.如果主语用了不定式,表语和宾语也要用不定式;主语用了动名词,表语和宾语也要用动名词,这在英语中称为对称性,如:
To see is to believe.= Seeing is believing.(眼见为实)
It is better to stay home than to go out.
不同点
1.不定式做主语常表示具体的某一动作;表示泛指或一般的抽象的概念时,多用动名词,如:
Walking is a good form of exercise for both young and old.
2.在”There/It +be+ no use(good/help/need)”之后常用动名词做主语,而少用不定式,如:
It/There is no use crying over the split milk.
It/There is no help taking this medicine.
★注意：如果该句型中用了for引出不定式的逻辑主语,就只能用不定式,如:
There is no good for us to do that exercise.
3.不定式可以和when,where,how,what,whether等连用,在句子中做主语,宾语和表语,
而动名词则不能,如:
How to solve the problem is a hot potato.
Where to put the box seems hard to decide.
Whether to do it hasn’t been decided.
What to do next is up to you.
4、不定式作主语通常表示一次性、未来的且具体的特指动作.
而动名词作主语通常表示习惯性、经常性和不具体的泛指动作.
5、动名词作主语和不定式作主语有时可以互换,
例如:It is dangerous playing (to play) with fire.
Seeing is believing./ To see is to believe.
但这种情况不具有规律性
1.不定式短语和动名词做主语时,常常为了保持句子的平衡,用it来做形式主语,如：
It is not easy to learn English well.It is no use asking him for help.
2.如果主语用了不定式,表语和宾语也要用不定式;主语用了动名词,表语和宾语也要用动名词,这在英语中称为对称性,如:
To see is to believe.= Seeing is believing.(眼见为实)
It is better to stay home than to go out.
不同点
1.不定式做主语常表示具体的某一动作;表示泛指或一般的抽象的概念时,多用动名词,如:
Walking is a good form of exercise for both young and old.
2.在”There/It +be+ no use(good/help/need)”之后常用动名词做主语,而少用不定式,如:
It/There is no use crying over the split milk.
It/There is no help taking this medicine.
★注意：如果该句型中用了for引出不定式的逻辑主语,就只能用不定式,如:
There is no good for us to do that exercise.
3.不定式可以和when,where,how,what,whether等连用,在句子中做主语,宾语和表语,
而动名词则不能,如:
How to solve the problem is a hot potato.
Where to put the box seems hard to decide.
Whether to do it hasn’t been decided.
What to do next is up to you.
4、不定式作主语通常表示一次性、未来的且具体的特指动作.
而动名词作主语通常表示习惯性、经常性和不具体的泛指动作.
5、动名词作主语和不定式作主语有时可以互换,
例如:It is dangerous playing (to play) with fire.
Seeing is believing./ To see is to believe.
但这种情况不具有规律性
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