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

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?