At one time,there were long queues of people waiting outside the CAAC offices.中的waiting怎么用?

At one time,there were long queues of people waiting outside the CAAC offices.中的waiting怎么用?

题目
At one time,there were long queues of people waiting outside the CAAC offices.中的waiting怎么用?
前面有个there were,是there be 句型么?后面的waiting是不是和前面的were构成过去进行时,感觉were被两个句型所用.是不是短一个were.自己瞎想.waiting在句中是个什么成分.
为什么要用waiting而不用wait呢?
答案
这里的waiting ---是个伴随状语,就上那群人现在的伴随状态,跟前面的there be 没关系
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