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not only but also连接两个主语时谓语
not only....but also是一个句型，译为不仅而且，是可以作连词的。
对于第一个问题，it 作形式主语，is是be动词，作为后面两个分句的谓语。类似于He is a teacher and a doctor.
在第一句里，有be convenient for这个短语。
not only放在be动词哪里
not only.but also.意为“不仅.而且.”,可以连接并列的短语,也可连接并列的句子.
1 连接并列内容作主语时,句子的谓语动词考虑就近原则,由but also后的名词决定谓语的单复数形式.
Not only my parents but also my brother has visited the museum.
不仅是我的父母,还有我的弟弟也参观了那家博物馆.
2 连接并列内容作谓语动词时,动词放在not only后和but also后.
He not only drinks but also smokes.
他不仅喝酒,还抽烟.
3 连接并列内容作宾语或表语时,
He is not only rich,but also tall and handsome.
他不仅富,而且又高又帅.
I love not only noodles but bread.
我不仅爱吃面条,也爱吃面包.
4 连接两个并列的句子时,第一个句子要使用倒装语序,也就是把助动词或be动词放到主语前面去.
Not
only does he plan to see you this weekend,but he wants
to see you a year from now.
他不仅会周末看你,他更希望一年后的这个周末还看到你.
Not only is
he the
breadwinner of the
family,he also
takes care of the
children's food and clothes.
他不但要出去工作维持家庭的生活,而且他还得料理孩子们的饭食和衣服.
be动词跟前面名词有关还是跟后面有关
我想你想问的是主谓一致这一语法现象中的就近原则。
当there be 句型的主语是一系列事物时，谓语应与最邻近的主语保持一致.
There is a pen,a knife and several books on the desk..
There are twenty boy-students and twenty-three girl-students in the class.
总的来说，在由not only…but also…，not just…but…，or, either…or…，neither…nor…连接主语的句子中及在there be句型中，谓语动词的单复数按就近原则处理，即按与谓语动词最靠近的那个主语来确定谓语动词的单复数形式。如：
Not only John but also I am going to Shanghai next week.
Either you or she is to go.
There is a pen,a few envelops and some paper for you.
not only but as well是什么意思
not only…but also/as well… 不仅……而且.
其实不存在not only but as well的结构,是not only but also,省略了also,然后在句末加上as well来加强语气.as well可以省略.
说明：
若连接两个成分作主语,其谓语通常与靠近的主语保持一致；
修饰主语一类词时,be动词在not only后；
修饰表语一类词时,be动词在not only前；
as well经常放在句尾.
eg;
Not only you but I am student as well.
I am not only a student but a worker as well.
Not only did he speak more correctly,but he spoke more easily.
八方求助得来的,
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