形式主语句型的例句如下：

It + be + 形容词 + to do sth.

It is my duty to care for that patient. 照料那位病人是我的职责。

It is not an easy thing to master a foreign language. 掌握一门外语不是件容易的事。

It isn’t right to speak ill of someone behind his back. 在别人背后说坏话是不对的。

It is very important to study and work hard. 努力学习和工作非常重要。

It is impossible for Mike to give her a hand. 对迈克来说，帮她一个忙是不可能的。

It + be + 形容词 + （for/of + sb.） + 动词不定式

It is nice talking to you. 跟你交谈真是愉快。

It is important for you to work hard. 对你来说努力工作非常重要。

It is easy for Mike to solve the problem. 对迈克来说解决那个问题很容易。

It is impossible for them to fix the computer. 对他们来说修好那台电脑是不可能的。

It + be + 名词 + that从句

It is five years since we last met. 我们上次见面已经五年了。

It is a pity that you didn’t go to see the film yesterday. 你昨天没看成那部电影真遗憾。

It + be + 介词短语/副词 + that从句

It is in this room that we had the party. 我们就是在这个房间里开派对的。

It is a bit windy. 现在有点风。

It + be + 动词 + that从句

It is clear that education is important. 显然，教育很重要。

There is no doubt that he is the best candidate for the job. 毫无疑问，他是这个工作的最佳人选。

What he said really surprised me. 他说的话真让我吃惊。

这些例句展示了形式主语“it”在句子中的不同用法，通常用于使句子结构更加平衡和流畅，特别是当主语部分较长或包含从句时。