What time is David leaving?点解不用过去式?
问题描述：
What time is David leaving?点解不用过去式?
问人几时走,不是What time did David leave?
答
如果现在David确实离开了,应该用What time did David leave?而如果他还没离开,你想知道他在将来哪个时间离开,那么就应该用What time is David leaving?这里be动词+现在分词 表示一个将来的概念.比如说,朋友给你打电...