不一定。

1、sb./sth be not only ...but also....

2、sb./sth not only 实义动词...，but also 实义动词....

not only ...but also

读音：英 [nɒt ˈəʊnli bət ˈɔːlsəʊ] 美 [nɑːt ˈoʊnli bət ˈɔːlsoʊ]

释义：不仅……而且，不但而且。

例句：

One should not only observe but also help.

不但要看，而且要帮。

扩展资料

not only ...but also的近义词：as well as

as well as

读音：英 [æz wel æz] 美 [æz wel æz]

释义：既…又…

语法：as well as常用来连接两个并列的成分，作“也，还”解。它强调的是前一项，后一项只是顺便提及。因此连接并列主语时，谓语动词与前一项一致。

例句：

They visited some factories， hospitals as well as the school.

他们参观了这所学校，还参观了工厂和医院

not only前面可以用be吗

可以呀，当not only和but also连接名词的时候就行，例如 She is not only a teacher but also a mother.