What time is David leaving?点解不用过去式?问人几时走,不是What time did David leave?

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What time is David leaving?点解不用过去式?
问人几时走,不是What time did David leave?

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,朋友给你打电话让你去他们家,如果要表达一“马上就来”的将来的概念,你应该怎么回答?
一般应该说:I'm coming
而不常说I will come

When did David leave?