Let's play volleyball on Sunday evening,shall we?
[1]构成：
┌ 前肯,＋后否
陈述句 │
└ 前否,＋后肯
┌ will you
祈使句,＋│
└ shall we
[2]用法：
a.时态、人称、数、前后一致
b.肯定、否定形式前后相反
"一致"和"相反"用红粉笔标记.
三、特例运用：
A.注意人称代词的例外
[1]如果陈述句部分的主语是不定代词nothing,something,everthing时,
后反意部分主语用it,如：
Nothing is too easy in the world,is it?
[2]如果陈述句部分主语是不定代词everyone,nobody,somebody,someone
时,后反意部分主语用they（当强 调全体时）或he （当强调个体时）.如：
No one knows him,do they?
Someone is waiting for you,isn't he
[3]如果陈述部分主语是指示代词this,that,后用it；如果是指示代词
these,those,则后用they.如：
This is a nice cap,isn't it?
These are boxes,aren't they?
[4]如果陈述部分是there be句型,后反意部分仍用there be句型.如：
There is nothing wrong with the clock,is there?
[5]如果主语是l’m,后反意部分用aren’tl或am'tl（或ain’t l,均
为美国用法）如：l’m right,ar en’t
[6]在祈使句的反意疑问句中,Let’s开头,后用shall we,其它情况用will
you.
B.注意肯定否定形式的例外
如陈述句部分含有no,
nobody,nothing,seldom,few,little,never,hardly,neither等否定词,及
too…to 句型时,后反意部分用肯定式.如果陈述句部分含有un-,in-,dis-
等表否定的词缀,后反意部分则用否定式 .如：
He has never been to Beijing,has he?
lt is unfair,isn't it?
C.注意助动词的例外
如果动词think,believe,suppose带有宾语从句时,反意部分助动词肯定、
否定形式要依从句而定.如：
l don't think he is right,is he?