When will they be coming here?这里为什么用原型be?

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Whenwilltheybecominghere?这里为什么用原型be?Whenwilltheybecominghere?这里为什么用原型be?Whenwilltheybecominghere?这里为

When will they be coming here?这里为什么用原型be?
When will they be coming here?这里为什么用原型be?

When will they be coming here?这里为什么用原型be?
因为前面有will,will后加动词原型