Question

什么时候用it is +形容词+to do sth？

Answer 1

1. It is + adj. (for sb.) + to do sth.“对某人来说做某事是怎样的。”

常用形容词：dangerous (危险的), difficult (困难的), easy (容易的), hard (艰难的), important (重要的), impossible (不可能的), interesting (有趣的), necessary(必要的), pleasant(舒适的), safe(安全的), useful(有益/用的)等

It is difficult to see and hear at the back.

It is important for Liu Sanzi to work on his father’s farm.

学生认真听老师讲课是非常必要的。______________________________________________

▲提示：避免句子头重脚轻，其中It做形式主语，不定式才是真正主语，翻译时先译不定式。

2. It is + adj. + (of sb.) to do sth. “某人做某事是怎样的。”

It’s very kind of you to help me.

It’s foolish of him to go alone.

▲提示：这一句型中常用描述行为者的性格、品质的形容词。如careful(细心的), careless(粗心的),clever(聪明的), foolish(愚蠢的), good(好的), kind(友善的), lazy(懒惰的), nice(友好的), polite(有礼貌的),right(正确的), wrong(错误的)等。

3.形容词+不定式

a.表示感情或情绪的形容词后面常接不定式，这样的形容词有：glad(高兴的), pleased(高兴的), sad(忧伤的), thankful(感激的)等, 如：

I’m glad to see you.　　　 　I’m very sad to hear the bad news.

b.表示能力和意志的形容词，如able(有能力的), certain(一定), ready(乐意的，有准备的),sure(一定)等常接不定式。如：

He is able to swim.　　　　

Lily is alw

Answer 2

想要表达干某件事情时的程度。

如：学习英语很难。

It is difficult to learn English.

见到你很高兴！

It is nice to meet you.

前面的it is 可以省略！