not only but also 中间加逗号吗?

看情况，如果not only 和 but also后是名词性短语或名词，不加逗号
如果是句子，要加逗号

not only....but also,中间一定要加名词或名词从句的.

要
EG He is not only my good friend,but also my terrific teacher.

应该不加。。