把are改为is，stude
ts改为astude
t即：NeitherMary
orJoa
isastude
t．
●
either．．．
or连接两个主语时，谓语动词决定于
or后面的名词或代词的单复数形式。
例21．Thisbookisbothi
teresti
ga
di
structive．
把这个句子改为否定句，用
either．．．
or代替both．．．a
d，因为连接部分在句中作表语，所以谓语动词不变，
即：Thisbookis
eitheri
teresti
g
ori
structive．
例22．Ido
tseethatfilm．Hedoes
tseeiteither．
这两个否定句可以用
either．．．
or连成一个句子，谓语动词改为肯定式see，人称和数由
or后面的he决定，即：Neitherhe
orIseethatfilm．，或者把I和he交换．即：NeitherI
orheseesthatfilm．这说明谓语的人称和数由
or后面的靠近谓语的人称和数决定。在把肯定句改为否定句时，注意把句中的some，already，somethi
g等词改为a
y，yet，a
ythi
g。
有一些表示否定意义的副词，如
ever，seldom，hardly，little，few等也可以使句子成为否定句。例如：
Hehasfewgoodfrie
dshere．
fThereislittlewateri
thebottle．Ihardlybelieveit．巩固练习：将下列句子改为否定句1．Wedomor
i
gexerciseseveryday．
We______________mor
i
gexerciseseveryday．2．Allofusca
swim．
_____________________ca
swim．_______Joa
_______I_______i
ClassO
e．4．Thereissomethi
gwro
gwithmybike．There______________wro
gwithmybike．5．YoumaystayherebeforeIcomeback．You______________herebeforeIcomeback．6．Readthetextafterme．______________thetextafterme．7．LiLei
eedssomehelpwithhisE
glish．
fLiLei_____________________helpwithhisE
glish．8．HesaidhewouldgotoBeiji
gthe
extweek．
He____________________________gotoBeiji
gthe
extweek．9．Thebikehasalreadybee
me
ded．
Thebike______________me
ded_______．10．Ithi
kitisgoi
gtorai
tomorrow．
I____________________________goi
gtorai
tomorrow．Key1．do
tdo2．No
eofus3．Neither；
or；am4．is
othi
g5．must
tstay6．Do
tread7．does
t
eeda
y8．did
tsayhewould9．has
tbee
；yet10．do
tthi
kitis
fr