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there was a big laughter in the classroom急求?

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there was a big laughter in the classroom急求?
there was 表示什么?主谓宾补状表这是那个?
这是主系表结构.
再问: 主语是 a big laughter 状语是 in the classroom 书上说 there was 是there be ?疑问?
再答: there这是主语 was是系动词 a big laughter这是表语 in the classroom这是地点状语