and作为两个主语的连接词，
be动词该用复数。用不同的连接词作主语的时候，be动词的单复数是不一样的。 both... and，and连接主语，要用复数形式。 French and German are spoken in this region. Both French and German are spoken in this region. not only...but also，either...or...，neither...nor...连接主语时，
谓语动词遵循
就近原则。 Not only I but also they are angry with you. Either you or I am right. Neither my mother nor I was listening to the news on TV.
as well as连接主语，谓语动词要以as well as前面那个字为准。
Mr. Robertson as well as Mrs. Robertson is late.