首先Not only…..but (also)表示的关系是递进,
其中also可以省略……….But/but also表示的是转折.
not only ...but also表示并列，不能表示转折，不要有先入为主的感觉认为not only...but also必须一起出现。单独出现but also是可能的。
197. (GWD-8-[url=]Q20[/url][alan1] )
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also caused erosion and very quickly deforested whole regions.
A.
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast) and [url=]gave[/url][alan2] consumers relatively inexpensive houses and furniture, but it also
B.
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast), which gave consumers relatively inexpensive houses and furniture, but also
C.
The systematic clearing of forests in the United States, creating farmland (especially in the Northeast) and giving consumers relatively inexpensive houses and furniture, but also
D.
The systematic clearing of forests in the United States created farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, [url=]but it also[/url][alan3]
(D)
E.
The systematic clearing of forests in the United States not only created farmland (especially in the Northeast), giving consumers relatively inexpensive houses and furniture, but it
在正常语序中: not only … but also 应连接两个相对称的并列成分。
在正常语序中: 短语本身不可以加入其它成份，比如变成：not only...but it also...是错误的（因为破坏了平衡）。
10. GWD25-Q10.
In 1926, in her second attempt to swim across the English Channel,
Gertrude Ederle not only crossed the Channel against currents that
forced her to swim thirty-five miles instead of the minimal twenty-one,
but she set a record for speed as well, by swimming the distance in
almost two hours faster than anyone had yet done.
A.
but she set a record for speed as well, by swimming the distance in almost two hours faster than anyone had yet done.
B.
but also set a record for speed, swimming the distance almost
two hours faster than anyone had yet done.
C.
but also swam the distance in almost two hours faster than
anyone had yet done, and setting a record for speed
D.
but also setting a record for speed by swimming the distance in
almost two hours faster than anyone had yet done.
E.
but, swimming the distance almost two hours faster than anyone
had yet done,[url=]she[/url][alan4] also set a record for speed.
125.The winds that howl across the Great Plains not only blow away valuable topsoil, thereby reducing the potential crop yield of a tract of land, and also damage or destroy young plants.
(A)
and also damage or destroy
(B)
as well as damaging or destroying
(C)
but [url=]they[/url][alan5] also cause damage or destroy
(D)
but also damage or destroy
(E)
but also causing damage or destroying
not only … but also 连接两个主语时，谓语动词要和与其最近的主语保持人称和数的一致。
例如：Not only the students but also the teacher was against the plan. / Not only the teacher but also the students were against the plan.
not only … but also 不能用在否定句中。
误： They don't fear not only hardship but also death.
正： They fear neither hardship nor death.
正： They don't fear either hardship or death.
not only … but also 连接两个分句，并且 not only 位于句首时，第一个分句中的主语和谓语要部分[url=]倒装[/url][alan6] 。
354.In 1978 a national study found that not only had many contractors licensed by a self-policing private guild failed to pass qualifying exams, they in addition falsified their references.
A.
they in addition falsified their references
B.
they had their references falsified in addition
C.
but [url=]they[/url][alan7] had also falsified their references
D.
they had also falsified their references
E.
but their references were falsified as well
[alan1]经典难题，没这个知识点考场上基本不可能做对，A选项迷惑性太强。
[alan2]倒装后这里用原型
[alan3]注意原句的逻辑---转折而非并列
[alan4]正常语序，不允许插入but和also两者之间
[alan5]错误
[alan6]重点！！
[alan7]这里可以插入两者之间
