在英语语法中，形容词和副词通常用来修饰名词和动词，但是它们也可以作为主语出现在句子中。其中，IT作为形主出现的情况较为常见，下面就是10种常用的IT作形主的句型。
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It's important to learn English if you want to communicate with people from all over the world.（如果你想和世界各地的人交流，学习英语是很重要的。）
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It's difficult to understand Shakespeare's plays without knowing the context of the time period.（如果不了解时代背景，理解莎士比亚的剧本是很难的。）
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It's easy to make mistakes when you are learning a new language.（学习新语言时很容易犯错误。）
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It's necessary to practice speaking English if you want to improve your fluency.（如果你想提高流利度，练习讲英语是必要的。）
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It's important to have a good pronunciation if you want to be understood by others.（如果你想被别人理解，拥有良好的发音很重要。）
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It's surprising how much vocabulary you can learn by watching English movies.（通过观看英语电影，你可以学习到很多词汇，这是令人惊讶的。）
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It's essential to read English books in order to improve your reading skills.（为了提高阅读能力，阅读英语书籍是必不可少的。）
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It's frustrating when you can't express yourself in English even though you know what you want to say.（即使你知道自己想说什么，但是无法用英语表达，这是非常令人沮丧的。）
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It's interesting to learn about different cultures through learning their languages.（通过学习语言了解不同文化是非常有趣的。）
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It's challenging to speak English fluently, but it's definitely worth the effort.（讲一口流利的英语是具有挑战性的，但是努力是值得的。）
以上就是10种常用的IT作形主的句型，如果你想提高自己的英语水平，这些句型可以帮助你更好地表达自己的想法和感受。记住，英语学习不是一蹴而就的过程，需要不断地练习和积累。加油！
