请教：关于英语主语的问题。 动名词作主语。动词原形作主语。不定时作主语。

Question

这些都不知道详细的用法。
∴ 能详细的就详细吧。

感激不尽。

Answer 1

动词不定式和动名词做主语，动词原形不能作主语。Ⅰ.动名词和不定式做主语的相同点
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)
(85)It is better to stay home than _A__ out.
A. to go B. going C. go D. gone
Ⅱ.动名词和不定式做主语的不同点
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:
(92)_B_ is a good form of exercise for both young and old.
A. The walk B. Walking C. To walk D. Walk
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.
★但是如果该句型中用了for引出不定式的逻辑主语,就只能用不定式,如:
(93) 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.追问

哪个作主语是表示做过的？ 哪个又是指习惯性的动作啊？

追答

不定式作主语是表示一次性的活具体行为，动名词作主语表示抽象的或习惯性的行为。

Answer 2

英语中，能做主语的有：名词、代词、数词、动名词、不定式、名词化的形容词、主语从句等。但是，注意，【动词原形是不能直接做主语】的。例如：
【American country music 】has become more and more popular during the 1990s.
【We】often speak English in class.
【Two 】times five is ten.
【One third of the students in this class 】are girls.
【To swim in Lijiang River】is a great pleasure.
【Smoking 】 does harm to the health.
【The rich 】should help the poor.
【When we are going to have an English test】has not been decided.
【It】is a pity【that he can't swim】.
动词原形，不能直接作主语。但是有不少固定句型常用动词原形放在句首或句子前面。例如：
Use your head and you will have a good idea.
Just come to me if you need help.
Please pay more attention to your handwriting.
祝你开心如意！O(∩_∩)O~~

Answer 3

请参考汉语修辞学，可触类旁通！ 楼上举那么多的例子，解决不了你的认知问题！