French language Q&A Forum

I want to say "I have not written since December.  Is this the correct way to say that: Je n’écris pas depuis décembre.

I see several people have asked this or similar question. I’ve read one available answer and am still confused, and I continually run up against this des vs les.

Example: Men use razors to shave. = LES hommes utilisent DES rasoirs pour se raser.

It is LES hommes because it’s referring to men in general. Why is it not LES rasoirs? Isn’t it referring to razors in general?

Thank you for any help. 

Pourquoi 'heureuse'? Je suis un homme!

In this sentence can't we use des amis Why d'amis

Great lesson but didn’t see it til I failed a test question:(. Is there a way to find new lessons easily if one has already gotten 100% on all existing lessons? Merci

The question was:

I'll appreciate your help, thanks.