作业帮想问个关于it用法的问题我想不通 In fact it is a hard job for the police to keep order in an important football match.这句前面的it 为什么不能换成this或者that
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想问个关于it用法的问题我想不通 In fact it is a hard job for the police to keep order in an important football match.这句前面的it 为什么不能换成this或者that
想问个关于it用法的问题
我想不通 In fact it is a hard job for the police to keep order in an important football match.这句前面的it 为什么不能换成this或者that
想问个关于it用法的问题我想不通 In fact it is a hard job for the police to keep order in an important football match.这句前面的it 为什么不能换成this或者that
it指代后面的to keep order in an important football match,放在句首作形式主语,真正的主语是to keep order in an important football match,而为了防止主语过长,才用it代替.this和that没有it的这种功能.
一般来讲，this that 多指代前文所提到的，而本句it指代后文的不定式短语。
这是个重要的句型结构： it is + ( a/an )+ 形容词 + 名词 （ for sb.) + to do sth. 这里的it是形式主语，真正的主语是：to keep order in an important football, 所以句子也可以写成： To keep order in an importand football is a hard job fot the police...
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这是个重要的句型结构： it is + ( a/an )+ 形容词 + 名词 （ for sb.) + to do sth. 这里的it是形式主语，真正的主语是：to keep order in an important football, 所以句子也可以写成： To keep order in an importand football is a hard job fot the police.但为了避免头重脚轻就用： it's...的结构。所以不能换成 that/this
又如：It's a good idea to listen to some music. 听些音乐是个不错的主意
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z这里面的it是形式主语，不能用that或者this替换。句子的主语是 to keep order in an important football match，正常语序的说法是to keep order in an important football match is a hard job for the police但是主语太长，出现头重脚轻现象，所以用it来做形式主语，真正主语放在后面。...
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z这里面的it是形式主语，不能用that或者this替换。句子的主语是 to keep order in an important football match，正常语序的说法是to keep order in an important football match is a hard job for the police但是主语太长，出现头重脚轻现象，所以用it来做形式主语，真正主语放在后面。
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