请举个例子,若不定式,动名词短语做主语,常用IT作形式主语,

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请举个例子,若不定式,动名词短语做主语,常用IT作形式主语,
如题

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)
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:
_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:
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.

请举个例子,若不定式,动名词短语做主语,常用IT作形式主语, it做形式主语,不定式,动名词作主语的表现是什么 it做形式主语时候,一般不是不定式作真正主语吗,为什么又用动名词作主语, 介宾短语能做主语吗?请举个例子!THANK! 动词不定式做主语与动名词作主语的区别动名词作主语和动词不定式做主语的区别? 当动词不定式作主语时,常用it做形式主语,而真正的主语则放在句末,这种句型结构总结为什么? 动名词短语做主语, 动名词做主语时可以用it作形式主语吗? It作形式主语,其真正的主语是动词不定式或动名词,二者区别是什么啊? 动词不定式和动名词!动名词结构作主语,可以用名词或代词属格形式作逻辑主语.如:It's no use your pret 分词短语做主语,有谁可以举个例子呢?