that和when的用法区别

when 的意思是“什么时候”，相当于时间副词，因此引导定语从句时所修饰的先行词是表示时间的名词。

that 直译是“那”，也就是表示一个东西，因此引导定语从句时所修饰的是一个东西或者一个人，我们所说的“缺不缺成分”是指主语、谓语、宾语，“完整的句子”是指不缺主语、宾语。

Had I known that I would never have come.

要是早知道，我绝不会来的.。

Keep going like that ─ you\'re doing fine.

就这样做下去——你做得蛮不错嘛。

He\'s really very human when you get to know him.

你若了解他，就知道他确实很有人情味。

You did well to sell when the price was high.

你在价钱高的时候出售，真明智。