不定代词相互代词疑问代词连接代词的用法
不定代词
指代不明确的人或物。代替名词或形容词，表示不同的数量概念。
可数 one, each, many, both, another, eigher, neither, (a) few
不可数 much, (a) little
可数/不可数 none, any, other, all, some
复合不定代词 anyone, anybody,anything; someone, somebody, something;
everyone, everybody, everything; nobody, nothing
相互代词（each other，one another）
相互代词无人称、数和格的区别，在句中作宾语。其所有格分别为each other’s，one another’s。一般来说，
each other指两者之间，one another指三者或三者以上之间。
They looked at each other and laughed. 他们相互看着对方，大笑不已。
新概念英语视频
八年级上册英语书人教版
人教版初二英语知识点
疑问代词
who，whom，which，what，whose等，在句中常作主语、宾语、定语、和表语等。
连接代词
引导名词性中从句的从句，关系代词引导定语从句。
替代词it/them，one/ones，that/those
1. it指代前面出现的单数名词；them指代前面出现的复数名词。
Yesterday I lost my pen, but I’ve found it.昨天我丢了钢笔，不过我又找到了。
2. one指代一个不确定的泛指的人或物，它代替的名词是“a + 名词”。其复数为ones。
Yesterday I lost my pen, but now I’ve bought one.昨天我丢了钢笔，不过现在我买了一支。
3. that指代特定的，但不是同一事物，可指代可数名词或不可数名词，它代替的是“the +名词”。复数为those。
My seat is next to that of our teacher.我的座位跟我们老师的挨着。
1. _______ you start eating in a healthier way, weight control will become much easier.
A. unless B. Although C. Before D. Once
2. I'll be out for some time. ______ anything important happens, call me up immediately.
A. In case B. As if C. Even though D. Now that
3. Lessons can be learned to face the future, ________ history cannot be changed.
A. though B. as C. since D. unless
4. The meaning of the word "nice' changed a few tines it finally came to include the sense "pleasant."
A. before B. after C. since D. while
5. Cathy had quit her job when her son was born _______ she could stay home and raise her family.
A.now that B. as if C. only if D. so that
6. There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
A. since B．if C. as D. while
7. I was glad to meet Jenny again, ________ I didn't want to spend all day with her.
A. but B. and C．so D．or
8. Don't turn off the computer before closing all programs, ________ you could have problems.
A. or B. and C. but D. so
9. I have heard a lot of good things about you I came back from abroad.
A. since B. until C. before D. When
10. ________ we have enough evidence, we can't win the case.
A．Once B．As long as C．Unless D．Since
