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would是情态动词吗?He said that it would be possible to build a pla

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would是情态动词吗?He said that it would be possible to build a platform in the centre of the Channel.
因为possible是形容词,所以前面要有系动词.又因为情态动词後边一定要用动词原形,所以用be原形.另外,would作情态动词时,後面的句子就一定是虚拟语气吗?上面这句话是虚拟语气还是别的其它用法?
it 是从句中的逻辑主语,还是形式主语?
不是,在这里不是.这里的would是will的过去时.为什么呢?你看下这一句话He said你看他往后引导it would be possible to build a platform in the centre of the Channel.的是一个句子 ,也就是从句.这是复合句.至于用would那是因为这是间接引语.这个直接引语一定是将来时.因为当直接引语后面引导的句子是一般将来时,它间接引语就用过去将来时.would +动词原型不就是过去将来时吗.
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