That在英语中的正确用法。「that」在英语中是使用最频繁的单词之一，并且有不同的使用方式。本文介绍一下何时使用「that」，如何使用「that」，「that」何时加与加都可以。
That作为限定词
That作为限定词使用时一般在句子开头，表明对象不在说话者眼前，距离本人比较远。
That's my friend Tom over there.
That's a pencil you have in your hand.
Those paintings are by Cezanne.
That is my house on the corner of the street.
That作为关系代词
That作为关系代词时一般连接两个子句，此时that可以用who或者which替代。
例如That＝Which时
Tom bought the apples that the man was selling.
OR
Tom bought the apples which the man was selling.
例如That＝Who时
Peter invited the boy that was new in class.
OR
Peter invited the boy who was new in class.
That作为宾语
That在句中可以作为宾语，例如
Jennifer hinted that she would be late for class.
Doug knew that he needed to hurry up.
The teacher suggested that we finish our homework.
That在关系从句中作为宾语
That在关系从句中作为宾语时一般加与不加that都可以，例如：
He invited the boy （that） he met on the train.
Shelly purchased the chair （that） she had seen at the auction.
Alfred wants to read the book （that） Jane recommended.
That作为主语
That可以在句中作为主语，此时使用that一般表示稍微正式些，在口语中并不常用。例如：
That it is so difficult is hard to understand.
That Mary feels so sad is very upsetting.
That our teacher expects us to do two hours of homework every day is crazy!
That作为名词或者形容词的补充形式
That在句中可以作为名词或者形容词的补充形式，以补充所界定的名词或者形容词的更多信息。一般是在回答回题时。例如：
Peter is upset that his sister wants to drop out of high school.
Mr. Johnson appreciates our efforts that have brought in a lot of donations.
She is certain that her son will be accepted to Harvard.
The Fact That …
The Fact That …经常连用，表示陈述一种情况，一般用在打头，例如：
The fact that he wants to see you should make you happy.
The fact that unemployment is still high proves what a difficult economy this is.
The fact that Tom passed the test shows how much he has improved.
That和连词合用
有些连词可以和that合用，例如「in order that, so that, providing that, in case that, now that, given that」等。而且这种表述方式一般多用于正式场合，例如：
He purchased the computer so that he might improve his typing.
Susan told him she would marry him providing that he found a job.
Alice feels happy now that she has moved into a new home.
That用于转述动词后
That用于转述动词后时一般that加与不加都可以，如say （that）， tell someone （that）， regret （that）， imply （that）等，例如：
Jennifer said （that） she was in a hurry.
Jack told me （that） he wanted to move to New York.
The boss implied （that） the company was doing very well.
That用于形容词后
That用于形容词后时，如果是在回答问题，一般that加与不加都可以。例如：
I'm happy （that） you found a new job.
She's sad （that） he's going to move to New York.
Jack is anxious （that） he didn't pass the test.
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