我想问一下关于英语连词的问题

这是英语中主谓一致原则.
最重要的有两种.

一是就近一致(即就近原则),搭配有:
A or B
either A or B +谓语动词(单复数与B一致)
neither A nor B
not only A but also B
e.g: Either your parents or your teacher knows this.
(注意:在疑问句中与A一致.e.g:Are you or she to blame?)

二是在主语后跟有as well as等引导的词组时,其谓语动词单复数与主语一致.常见的有:

As well as/as much as
Rather than/no less than
With/together with/along with +名词+谓语动词(单复数与主语一致)
In addition to/besides/but/except
Like/including/followed by/accompanied by(陪伴)
e.g:The teacher as well as the students was excited.
(注意:这一条有个口诀:2234,四个1,顺序如上,已排列好)

就这些了,如果你还不明白,有英语语法实践指南的话,第4版在14～26页,第5版也大概在那附近几页吧,上面写得很详细的.

应该是就近原则
比如说：Not only I but also my sister has been to Shanghai.
这个句子里的动词离sister较近，即使I和my sister是两个人，也用has而不用have.

not only…but also…, 是就近原则either…or…
neither…nor… 也是就近原则，但都就进后面的：either he or i am student

....as well as... 表示两者在某一方面相同时用as+形容词或副词的原形+as 比