问题描述: he will go out to play for a while when(完成) all his homework 括号里的英文是什么 1个回答 分类:英语 2014-11-17 问题解答: 我来补答 填 To finish.When 后要以接不定式,但不可以接现在分词.例:Ask him when to open it.问问他什么时候打开They knew when to attack and when to retreat.他们知道什么时候进攻和什么时候撤退. 展开全文阅读