also可以省略。
Not only…but also是英语中比较常见的一个关联词组，用于连接两个表示并列关系的成分，着重强调后者。它的意思是“不仅 … 而且 ...”；其中的also可以省略。
1、not only…but的省略及其变体：
Not only…but also中的also可以省略。有人认为该句型所连接的第二部分最高级形容词或它所表示的范围、程度、影响等超过第一部分时，常将also省略。例如：
He was not only a successful writer but (also) the greatest poet of his time.
他不仅是一位成功的作家，而且是他那个时代最伟大的诗人。
He is famous not only in China but (also) in the whole world.
他不仅闻名中国，而且闻名全球。
2、”not only A but also B”结构中的A和B通常是同等成分。
由于同一成分常常由同一词类的词来担任，所以A与B常常也是同一词性，这从本文第一部分的例句中即可看到。但是，也有A与B属于不同词性的情形。如：”He is not only very clever, but also a very hard worker, and he likes to do everything well.（他不但聪明，而且能下功夫。他喜欢把每一件事都做得很好。）
扩展资料：
not only but also主要用法：
1．连接主语：
Not only I but also Tom and Mary are fond of watching television.
不仅我，而且汤姆和玛丽都喜欢看电视。
Not only Jim but also his wife saw her.
不但吉姆而且他妻子也见到了她。
2．连接谓语动词
The Americans and the British not only speak the same language but also share a large number of social customs.
英国人和美国人不但语言相同，而且有很多相同的风俗习惯。
3．连接宾语：
The problem for the recipient was trying to guess not only who the sender was, but also what his secret feelings might be.
收信人不仅要尽力猜出是谁的，还要推测寄信人内心有什么想法。
4．连接宾语补足语：
Light and bright colors make people not only happier but more active.
浅色和鲜艳的颜色不但使人看了高兴，也会使人更加活泼。
5．连接表语：
Shakespeare was not only a writer but (also) an actor。
莎士比亚不仅是一位剧作家，而且是一位演员。
6．连接状语：
If your friend reminds you kindly of your faults, take what he says not merely pleasantly but thank fully.
如果低你的朋友善意地指明出你的缺点，你不但要欣然接受，而且要心怀感激之情。
7．连接从句：
He didn’t let us off the hook until we had proved not only that we knew what an organism was but also that we had the fortitude to stand up for the truth.
直到我们证明了我们不仅知道什么是生物体，而且具有坚持真理的不屈不挠精神时，他这才放过我们。
Not only…but also是英语中比较常见的一个关联词组，用于连接两个表示并列关系的成分，着重强调后者。它的意思是“不仅…而且．..”；其中的also有时可以省略。
主要用法
1、连接主语：
Not only I but also Tom and Mary are fond of watching television.
不仅我，而且汤姆和玛丽都喜欢看电视。
Not only Jim but also his wife saw her.
不但吉姆而且他妻子也见到了她。
2、连接谓语动词
The Americans and the British not only speak the same language but also share a large number of social customs.
英国人和美国人不但语言相同，而且有很多相同的风俗习惯。
注意not only…but also连接的动词一般不重复，这与汉语不同。如汉语说“我不仅懂英语，而且懂俄语”，英语则说“I know not only English but also Russian”，而不说“I not only know English but also know Russian”。
再如：“气体不仅改变形状，而且改变体积”，英译为“A gas changes not only in shape but also in volume.”（注意介词常重复）
3、连接宾语：
The problem for the recipient was trying to guess not only who the sender was, but also what his secret feelings might be.
收信人不仅要尽力猜出是谁的，还要推测寄信人内心有什么想法。
4、连接宾语补足语：
Light and bright colors make people not only happier but more active.
浅色和鲜艳的颜色不但使人看了高兴，也会使人更加活泼。
5、连接表语：
Shakespeare was not only a writer but (also) an actor。
莎士比亚不仅是一位剧作家，而且是一位演员。
6、连接状语：
If your friend reminds you kindly of your faults, take what he says not merely pleasantly but thank fully.
如果低你的朋友善意地指明出你的缺点，你不但要欣然接受，而且要心怀感激之情。