-We just saw John at the bookstore.-That’s strange; I didn’t think he ( ) back until tomorrow
问题描述：
-We just saw John at the bookstore.-That’s strange; I didn’t think he ( ) back until tomorrow
括号内为什么一定要用was to come,不能用will come
答
will do是现在竟来时的基本结构
而句子时态为过去时 应用过去将来时
was/were to do 表示过去将要做某事