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That box is too heavy to carry.本句话中没有用it在carry 后,为什么?什么时候it

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That box is too heavy to carry.本句话中没有用it在carry 后,为什么?什么时候it 不能省略.请举例
That box is too heavy to carry.本句话中没有用it在carry 后,为什么?什么时候it
1.此句型是一个简单句,句中主语同时还做不定式的宾语,即that box就是carry的宾语,所以carry后面不能再出现it.
此固定句型可以归纳为：sb/sth be + 形容词 + to + 动词原形（+ 介词）.
再如：English is difficult to learn.（English还做learn的宾语）
The man is easy to work with.（The man还做(work) with的宾语）
2.如果是含有状语从句的主从复合句,则it不能省略,如：
如：That box is so heavy that I can't carry it.
再如：This is such a heavy box that I can't carry it.
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That box is too heavy to carry.本句话中没有用it在carry 后,为什么?什么时候it It is too heavy a box fer me to carry 为什么 too heavy a box 不是 the box is too heavy to carry (it) the box is heavy I cannot carry it 为什么是so,that而不是too,that? The big box is too heavy for me to carry,后面为什么不加it the big box is too heavy for me to carry.为什么不加it the box is too heavy for me to A carry it away B lift it up The box is too heavy to carry为什么不能改为The box is too heavy to 初中英语句子the box is too heavy for the child to carry,句末为什么不加it I guess the box is too heavy for you to carry it. － This box is too heavy for me to carry it upstairs. This box is too heavy for me to carry it upstairs._____.A、 Y