If I have this opposition construction with not like
It's all about intimidation(,) not the law.
should I place a comma before not?
If I have this opposition construction with not like
It's all about intimidation(,) not the law.
should I place a comma before not?
Yes you should.
It's all about intimidation (pause) not the law.
The pause is provided by the comma. Another reason might be that this could be thought of joining to different sentences.
It's all about intimidation. It is not about the law.
Someone should note that the above advice about putting a comma where you "hear it" or "take a breath" is only (if that) applicable to non-American English. In American English, there are rules to when you do and do not use commas, and they are not based on hearing, breaths or pauses (although certainly there is some overlap). The above comma usage is correct because "not the law" is a dependent clause.
Place the comma where you hear it.
Commas, like full stops, are used to indicate intonation;
the intonation curve that the comma represents is not a pause.
It's a place where the speaker can pause, but normally doesn't.
The comma intonation is a sine curve: mid - high - low - mid.
It's the intonation one uses in counting, or lists: thirty-three, thirty-four, thirty-five, ...
So when you hear such an intonation profile in speech, you can put in a comma in writing;
conversely, when you're reading and come on a comma, your mind's ear should hear it.
If what your mind's ear hears in that case sounds terrible, you're reading a writer who doesn't understand how to use commas. Perhaps they'd been taught a bunch of silly rules about which words you can put a comma before, instead of the truth. Despite all our efforts, this still happens.