it is adj to do sth 什么意思

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it is adj to do sth 什么意思
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it is adj to do sth 什么意思
it is adj to do sth 什么意思

it is adj to do sth 什么意思
看例子:It is interesting to play pingpong.
打乒乓球很有意思.
所以it is+adj+to do sth.的意思是:
做某事让人感觉怎么样

做什么事怎样 adj表示形容词

动词不定式在句中作主语
  1)不定式或不定式短语作主语时,可直接放在句首。如:
  To learn a foreign language is necessary. 学习一门外语是必要的。
  2)当不定式短语较长时,通常用it作形式主语放在句首,将真正主语不定式结构放在句子后部。其常见句型有:
  a. It is /was+形容词/ 名词+ to do st...

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动词不定式在句中作主语
  1)不定式或不定式短语作主语时,可直接放在句首。如:
  To learn a foreign language is necessary. 学习一门外语是必要的。
  2)当不定式短语较长时,通常用it作形式主语放在句首,将真正主语不定式结构放在句子后部。其常见句型有:
  a. It is /was+形容词/ 名词+ to do sth.做……是(如何的)。
  b. It takes sb. some time to do sth. 做某事花费某人……
   It is easy to pick up China Radio International Programmes.
   收听中国国际广播电台的节目很容易。
  It took me 3 days to read the book.
  读这本书花了我三天时间。
  3)当不定式需要带上自己的逻辑主语时,须用介词for / of, 即for / of sb. to do sth. (它被称为不定式的复合结构。)其基本句型为:
  A)it is+ 形容词+of sb.+ to do sth. ==sb.+ be+形容词+to do sth.
该句型中形容词用来描述不定式行为者的性格、品行等,形容词多为brave, careless, clever, polite, wrong, kind, good, nice, foolish, rude (粗鲁的), selfish(自私的)等。如:
  It’s very kind of you to say so. == You're kind to say so. 谢谢你这样说。
  B) It is + 形容词+ for sb. to do sth.
  = It’s + 形容词 + that + sb. do sth.
  在此句型中,形容词只对不定式行为者作某种描述,而不涉及其品行。这类形容词有: difficult, hard, easy, important, dangerous, possible, impossible, necessary 等。如:
  It is impossible for him to carry a big box.
  ( = It's impossible that he carries a big box. )
  4)如果是疑问句或感叹句,则只能用it作形式主语的形式,如:
  Is it important to practise listening? 练习听力很重要吗?

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