摘要：it作形式主语①It is + 形容词 + to do sth.It is easy to learn basic English words.学习基础英语单词是容易的。It is hard to forget the film.忘记那部是很难的。②It is

it作形式主语

①It is + 形容词 + to do sth.

It is easy to learn basic English words.

学习基础英语单词是容易的。

It is hard to forget the film.

忘记那部是很难的。

②It is + 形容词 + for/of sb. + to do sth.

It is difficult for me to solve this math problem.

对我来说，解决这道数学题是困难的。

It is kind of you to help the old man cross the road.

你帮助那位老人过马路，真是太善良了。

③It is + 形容词 + that ...

It is obvious that he has made a big mistake.

很明显他犯了一个大错误。

It is certain that we will win the game.

我们肯定会赢得这场比赛。

④It is said/reported that ...

It is said that there will be a heavy snow tomorrow.

据说明天会下大雪。

It is reported that the famous actor has got married.

据报道那位著名的演员已经结婚了。

It is believed that hard work can lead to success.

人们相信努力工作能带来成功。

It's known that the earth is round.

众所周知地球是圆的。

⑤It is a /an + 单数名词 + to do sth.

It is a pleasure to meet you here.

在这里见到你是一件愉快的事。

It is an honor to be invited to the birthday party.

被邀请参加这个生日派对是一种荣幸。

来源：三省生