what is to be done then 与what is doing then哪种说法正确

来源:百度知道 编辑:UC知道 时间:2024/07/07 03:24:55
还有:learn to do 与learn doing 两种表达都对吗,有什么区别?
a child can't learn ______ (spell) without being helped.这里该填哪种?

第一个对。因为what is to be done 是被动式,事情是被做的,被处理的。what is doing没有主语。
前者是学习做某事。后者是learn by ...ing
I learn to speak English.
I learn English by working hard.
a child can't learn spelling without being helped.
这里的spelling是名词。