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英语语法问问分析Time is tricky.It is difficult to control and easy t

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英语语法问问
分析Time is tricky.It is difficult to control and easy to waste.包含了哪些语法知识!
1.动词不定式作状语
句中的 it 并不是it is difficult to do (sth) 用法中的形式主语,而是做主语,指代前面出现的time,
句子的意思是:
Time is difficult to control and easy to waste.与上句说"Time is tricky." 在语义上呼应.
语法:主语+系动词+形容词+动词不定式,其中不定式做状语 
eg:The chair looks rather hard,but in fact it is very comfortable to __.(B).
A.sit B.sit on C.be seat D.be sat on
如果不定式为不及物动词,其后应有必要的介词.
假如 it 做形式主语则逻辑主语为 to control 和 to waste,变成了"To control is difficult and to waste is easy." 缺宾语.
2.Parallelism / Parallel Structure,平行结构:
difficult to control 和 easy to waste 相呼应,工整而有韵律
本句也可以省略为:Time is tricky -- difficult to control,easy to waste.