Another question about negatives - I'm not in a negative mood today.....honest

Can the -en suffix be used with a negative suffix to form a negative instruction?

For example:

uyuyan köpek
sleeping dog

uyumayan!
no sleeping!

Yes but they both are verbal adjectives and need to be followed by a noun or need to modify a noun even it is not mentioned but understood. Thus the second one is missing a noun.

"uyumayan köpen" would ne correct.

But would it be correct to say to Floss
Floss uyumayan!

Meaning - Floss, no sleeping!
i.e - sleeping is not allowed.

The negative imperative is suitable in this case.

Yes, very good bod. You could also use "yok" again in a very simply way.

Hi Bod,
This is a good reply but is not exactly correct.

İyi bir cevap ama tam olarak doğru değil.

So I assume it needs the -an suffix:
Floss uyuyan yok

Is that better?

Think of it as "No smoking" which means "Sigara içme(yin)(iz)"

For example, if your friend tries to light a cigaratte in the subway station, you use: "burada sigara içme" ("no smoking here").

If your teacher tends to light one cigaratte in the subway station, you use: "burada sigara içmeyin" or "burada sigara içmeyiniz" (again, "no smoking here").

"Floss, no sleeping" means "Floss, uyuma" - if he/she/it is a - for instance - close friend of yours. It's informal of course.

"Floss, no sleeping" means "Floss, uyumayın(ız)" - if he/she/it is - for instance - your teacher. It's formal.