To speak good English is not easy.speaking good

To speak good English is not easy.speaking good
To speak good English is not easy.
speaking good English is not easy.
那句话对?为什么?对的原因是什么?

两节均对,不定式或动名词均能作主语.但本句第二句较好,因为动名词表示泛指,而不定式一般表将来或特指.
再问： 书上的例句是第一句，但是我觉得用动名词也可以
再答： 动名词表泛指。如：
Looking after patients is my job. (My job is looking after patients）
不定式表特指。如：
To look after the patient is my job this afternoon.(My job this afternoon is to look after the patient.)
再问： Seeing he was very busy ,i left quietly.
To see he was very busy i left quietly.
那个对？
再答： Seeing he was very busy ,i left quietly

动词不定式不能作原因状语。
再问： 动词不定式做状语可表示原因
再问：
再答： 不定式用作原因状语的情形主要用于某些“be+形容词+不定式”结构。如：
He was glad to be home again. 他又回到家里，感到很高兴。
We’re proud to be young people of China. 作为中国青年我们感到自豪。
She wept to see him in such a terrible state. 她看到他这种可怕的样子就哭了。
再问： 谢谢^ω^

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