（1）作主语：
Both of the twins are doctors.
All of them are honest.
Neither of them is a doctor.
None of them is/are honest.
（2）词组：
Both Li Ping and I are students.
Neither Li Ping nor I am a student.
（3）作形容词：
on both sides of the river
on either side of the river

注意下面句子转化：
Both of them are teachers.
改成否定句是： Neither of them is a teacher.
All of us are students.
改成否定句是： None of us is a student.      或： None of us are students.

5）one ...the other(s)表示一个……其余的……，是有范围的；some...others 表示一些……另一些……，是无范围的；another 表示很多中的另一个，再……个。如：
He has two brothers. One is an engineer, the other is a writer.
Some like football. Others like basketball.
Some books on the shelf are in Chinese, the others in English.
She will be in hospital for another two weeks.（她将在医院再住两星期。）