“that”是英语中使用频率极高的一个词，兼有代词、副词和连词等几个词性，既发挥实词的作用，又担当架构复杂句式的重任。在每年的高考试卷中，that的考查几乎是不可或缺的。
一个that，不同“身份”
请看下面一组句子，你能够辨清that的词性、词义和作用吗？
1. The English spoken in the United States is only slightly different from that spoken in England.
2. —Could you tell me how to get to Victoria Street?
—Victoria Street? That is where the Grand Theatre is.
3. The thought of going back home was all that kept him happy while he was working abroad.
4. A warm thought suddenly came to me that I might use the pocket money to buy some flowers for my mother’s birthday.
5. Pop music is such an important part of society that it has even influenced our language.
6. Roses need special care so that they can live through winter.
7. It was in New Zealand that Elizabeth first met Mr. Smith.
8. Sometimes it was a bit boring to work there because there wasn’t always that much to do.
在上面的几句话中，that分别表示：
1.用作代词，替代前面提到的单数不可数名词或概念，本句中代指the English；
2.用作代词，说明上面刚刚提到的人、事物、想法等，本句中代指Victoria Street；
3.关系代词，在限定性定语从句中代替先行词all，在从句充当主语；
4.从属连词，引导名词性从句，只起连接作用，无具体意义，在本句中是thought的同位语；
5.引导结果状语从句；
6.引导目的状语从句；
7.用于强调句型中，起连接作用；
8.程度副词，等于so。
由于在多个语法结构中，都涉及that的使用，而that又容易与其他相关的词或结构发生混淆，所以要真正掌握that的用法，必须把握好几组词和结构的区别。