it is no use为什么用doing no use doing是固定短语吗?

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no use doing是固定短语吗?

use doing是固定短语吗?

没有 it is not use doing 这种结构,应该是 it is no use doing sth.。
这是 “形式主语 it+no use+动名词短语 (真实主语)” 结构,意思是 “做某事是没用的(或无益的)”。
如果表语表示 “好处” 之类的意思,如名词 good、use、help 以及形容词 useful、helpful,就采用这种用动名词作主语的结构。

use的句型?

Its no use doing sth .做某事没有用.
used to do sth 过去常常做某事
be used to doing sth 习惯于做某事
be used to do sth 被用于去做某事

it is后加形容词还是副词?

①It is 形容词( of / for sb.) to do sth.
  通常用 of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。
 ②It is 形容词 that sb. (should) do sth.(虚拟语气)
  能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。有时可省去should而直接用动词原形。如:
  It is important that we should pay close attention to grain.
  It is natural that he(should)say so.
③It is no use/ good doing sth.
  It is no use trying again It is of no use to try again.