题目内容：

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

优质解答

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 ...ingI learn to speak English.I learn English by working hard.a child can't learn ...