French language Q&A Forum

For the sentence “Yes, you’re not wrong” I wrote “Oui, tu ne te trompes pas” thinking that I could use “se tromper” as an alternative to “avoir tort”, but it appears not. Can you explain ?

Hello all,

I've seen several French expressions/phrases where there is no definite or indefinite article, where there would be one in English. 

For example. C'est bon signe meaning that's A good sign, j'ai rencard avec lui meaning I have AN appointment with him.

Is there a general rule that explains this ?  

Thanks,

Jean