as well as 连接主语时谓语动词应该同前项保持一致 Ex： She as well you likes the book.
or, either.. or , neither...nor, not only..but also 等连接的名词或代词做主语时谓语动词形式要同最近的主语保持一致. Ex：
One or two friends are coming this evening.
Neither I nor he is to blame.
She is not only a professional artist, but also a first-rate teacher.