However， not all advertising is about selling products and services for a profit.

【解析】该句表示的是部分否定。not 与all, both, everyone, everybody, everything, 以及every+名词连用.

Not every student goes home on Sunday.并非每个学生星期天都回家。

She doesn’t like both of the books. 她并非两本书都喜欢。

All man here are not honest.

=Not all man here are honest.

这儿的人并非都诚实。

Both of the brothers don’t like the film

=Not both of the brothers like the film.

兄弟俩不都喜欢这部电影。

None of the man is honest.

他们都不诚实

Neither of the brothers likes the film.

兄弟俩都不喜欢这部电影。