这个句子：it took the students more than three hours to do their

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这个句子：it took the students more than three hours to do their homework every day.主语太长时,it 充当形式主语,放在句尾,保持平衡.不太理解,怎么讲是保持平衡?头重脚轻的情况下是什么情况?形式主语是怎么解释?

这是英语语法术语.其实就是主语太长,后面太短,显得头重脚轻.比如主语to do.took me 2 hours.
前面主语是to do.看起来就很臃肿,有时候听话者听了半天不知道你要说什么.最好才听出来是to do.这件事花了我2个小时.所以干脆英语中就用it代指一件事（其实真正的事儿就是to do.),听话者一听就知道是it这件事花了我2个小时.至于是什么事,那就慢慢听.

这个句子：it took the students more than three hours to do their It took us more than two hours preparing the dinner.这个句子是否正确 It __ him more than three hours to finish that work. A took 将句子改为它的同义句：1.It took Jim over three hours to do the job. It took the model maker Jay Sheppard more than 100 hours to It took me three hours to do the homework.(改为同义句)拜托了各位 It took the students two hours to do theri homework yesterda it took them three hours to work out the problem? 组成句子:get,two,more,took,hours,to,there,it, It took me three hours to finish the work.(划线提问) three hours It took me (three hours) to do my homework.( ) ( )( )to do ( it took me more than two hours to finish my homwork 保持原句意思