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1. Did you come by air 2.Are you coming by air?

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1. Did you come by air 2.Are you coming by air?
请问 第一句用did 因为come是行为动词 那为什么第二句也有come 却用are呢? 还有 第二句的句意是1.你是乘飞机来的吗?还是2.你会乘飞机来吗?
1. Did you come by air 2.Are you coming by air?
意思理解对了,第一句是过去时,第二句是将来时,只不过形式上是现在进行时,come,go,fly等单词都是这样的规律,在现在进行时形式中本身就要求是be动词加上行为动词,而在一般现在时,一般过去时中助动词主要是帮助行为动词将句型变成不同句式,如否定句,疑问句等
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