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To err is human, to forgive is divine．犯错误是人之常情，能宽恕则难能可贵。
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To know something about English is one thing; to know English is quite another．懂点儿英语是一回事，掌握英语完全是另一回事。
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但把不定式放在句首的情况是很少的，在多数情况下都在句首用一个先行词it作主语，而把不定式表示的真正主语放到后面，这样可使句子显得更平稳：
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It’s better to be on the safe side．稳重行事还是比较好一点儿。
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It’s our duty to help you．帮助你是我们的责任。
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It takes 30 hours to get there by train．坐火车到那里要30个钟头。
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在许多形容词（如all right，difficult，easy，foolish，good，hard，nice，possible，proper，right，unwise，wise，wrong等）后面可用这种不定式作主语的结构，特别是它后面有时有一个of引起的短语：
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It’s kind of her to think so much of us. (＝She is kind to…) 难为她这样为我们着想。
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(It’s) Awfully good of you to come and meet us. (＝You’re awfully good to…) 非常感谢你来接我们。
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It’s unwise of them to turn down the proposal. (＝They are unwise to…) 他们拒绝这个建议是不明智的。
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但只有某些形容词（如careless, clever, considerate, foolish, good, kind,impolite, naughty, nice, right, rude, silly, stupid, unwise, wise, wrong等）后能用这种结构。
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作表语（补语）：
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My idea was to learn Russian．我的想法是学俄语。
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Her only wish was to do something for him．她唯一的愿望是为他做一些事。
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Your job is to type the memo．你的任务是把备忘录打出来。
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The main thing is to stay calm．要紧的是保持镇静。
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不定式前面有时可加一个用for引起的短语，表示这是谁的动作：
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It’s time for the children to go to bed．孩子们该睡觉了。
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His idea is for us to travel in separate cars．他的意思是我们分乘不同的汽车。
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Have you got anything for me to do？你有没有什么事需要我做？
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It’s not easy for a foreigner to learn Chinese．外国人学汉语是不容易的。
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另外，不定式还可有进行形式、完成形式和被动形式，也有否定式：
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It’s nice to be sitting here with you．现在和你一道坐在这里很好。
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I’m sorry to have come late (＝that I came late)．
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She needs to be told right away．需要马上通知她。
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