to do主要用來表示一次性具體性將要發(fā)生性的行為。其邏輯主語暗中有所指。doing主要用來表示經(jīng)常性、習(xí)慣性、抽象性發(fā)生的行為。其邏輯主語暗中無所指。

1.不定式做主語常表示具體的某一動(dòng)作;表示泛指或一般的抽象的概念時(shí),多用動(dòng)名詞,如:

Walking is a good form of exercise for both young and old.

2.在”There/It +be+ no use(good/help/need)”之后常用動(dòng)名詞做主語,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.

但是如果該句型中用了for引出不定式的邏輯主語,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等連用,在句子中做主語,賓語和表語,而動(dòng)名詞則不能,如:How to solve the problem is a hot potato.

to do，一次性的動(dòng)作。doing經(jīng)常的行為。

不定式做主語一般指具體的某一動(dòng)作，而動(dòng)名詞做主語多是泛指。如：Learning is necessary for all of us in this society。