① How long does it take to get to school?②It takes me ten minutes.-③How far is it from your home to school?④It is 5 kilometer.It 表示什么 陈述句It是形式主语真正主语是什么 为什么不用真正的主语

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① How long does it take to get to school?②It takes me ten minutes.-③How far is it from your home to school?④It is 5 kilometer.It 表示什么 陈述句It是形式主语真正主语是什么 为什么不用真正的主语
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① How long does it take to get to school?②It takes me ten minutes.-③How far is it from your home to school?④It is 5 kilometer.It 表示什么 陈述句It是形式主语真正主语是什么 为什么不用真正的主语
① How long does it take to get to school?②It takes me ten minutes.-
③How far is it from your home to school?
④It is 5 kilometer.
It 表示什么 陈述句It是形式主语真正主语是什么 为什么不用真正的主语

① How long does it take to get to school?②It takes me ten minutes.-③How far is it from your home to school?④It is 5 kilometer.It 表示什么 陈述句It是形式主语真正主语是什么 为什么不用真正的主语
① How long does it take to get to school?
②It takes me ten minutes.
这两个句子中it是形式主语,代替动词不定式to get to school,动词不定式作主语一般用it代替,避免主语太长,而谓语太短,出现头重脚轻的现象.
③How far is it from your home to school?
④It is 5 kilometer.
这两个句子中的it指距离,it可以指距离,时间等作主语
例如:what time is it?
what day is it today?

是形式主语,真正的主语太长了,外国人不喜欢头重脚轻。