英语,start,用法求教The fire is thought to have started in an upstairs room...火灾被认为是从楼上的一个房间里开始燃起的.请问这句话改成主动语态要怎么改,然后为什么这里要加to啊?

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英语,start,用法求教The fire is thought to have started in an upstairs room...火灾被认为是从楼上的一个房间里开始燃起的.请问这句话改成主动语态要怎么改,然后为什么这里要加to啊?
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英语,start,用法求教The fire is thought to have started in an upstairs room...火灾被认为是从楼上的一个房间里开始燃起的.请问这句话改成主动语态要怎么改,然后为什么这里要加to啊?
英语,start,用法求教
The fire is thought to have started in an upstairs room...
火灾被认为是从楼上的一个房间里开始燃起的.
请问这句话改成主动语态要怎么改,然后为什么这里要加to啊?

英语,start,用法求教The fire is thought to have started in an upstairs room...火灾被认为是从楼上的一个房间里开始燃起的.请问这句话改成主动语态要怎么改,然后为什么这里要加to啊?
主语是物啊,所以一定得是“被认为”,改成主动就得加个“人”的主语.
we think the fire started in an upstairs room..
你问为什么加to?没理由,被认为如何如何,be thought to .
还有呢,因为是过去发生,所以用过去式啦.

Some people think that the fire has started in an upstairs room.前一句中to have started in an upstairs room 是不定式完成时作主语补语,所以用to.