to play with fire is dangerous是不是没有这样的用法.应该是it is dangerous to play with fire.to play 是主语.with fire是介词短语做定语.to play with fire is dangerous是不是主语从句?如果是.引导词是什么.先行词呢
问题描述：
to play with fire is dangerous是不是没有这样的用法.
应该是it is dangerous to play with fire.to play 是主语.with fire是介词短语做定语.
to play with fire is dangerous是不是主语从句?
如果是.引导词是什么.先行词呢
答
语法上没有错啊
答
不是啊 只是个简单句to play with fire 是主语is系动词
dangerous表语
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英语中一般都会把to play with fire is dangerous这样的句子改成It is dangerous to play with fire这样的形式,目的是为了避免给人头重脚轻的感觉.it是形式主语,指代的是to play with fire（真正的主语）.to play wi...
答
在it is dangerous to play with fire.中to play with fire是主语
to play with fire is dangerous不是主语从句，而是一个用to连接的不定式作主语的句子，还可以动名词表达，Playing with fire is dangerous.