I now why you are confused. I had written:
"There is a suffix that is almost the same as
-lı, -li, -lu, -lü."
Now I have changed this into:
"There is a suffix in English that is almost the same as
-lı, -li, -lu, -lü."

On reply #7 and #8 bod and you are talking only about one suffix and you both said it means "with" and I disagreed.

Let's summerize:

"-le, -la " is shorter version of "ile" and means ". with 2. and

"-lı, -li, -lu, -lü" is a suffix that creates adjectives from nouns. It is smillar to "-y" in English.
salt > salty
tuz > tuzlu

Sorry, I mixed two different things. It is not the same with verbal nouns and normal nouns.

Normal nouns:
N-den sonra > before N
N-den önce > after N

okuldan sonra : after school
tatilden önce : before holiday

Verbal nouns:
V-meden önce : before V-ing
V-dikten sonra : after V-ing

We have a rich collection of Turkish poems translated into English. Here is our poems page:
http://www.turkishclass.com/poems.html

You can also access this page from the menu on the left by clicking "Learn Turkish > Turkish Poetry".

The majority of the translations belong to our admin but you don't see there his name becuase he was too modest to mention it.

But your name or nickname must be mentioned if you are going to send us your translation.

This is the formal criteria:

1. Author: Type as the same as you see in the poems page. For instance you will see "Orhan Veli Kanık" so type exactly the same.
2. Title in Turkish: Type This With First Letter in Capitals
3. Title in English: Type This With First Letter in Capitals
4. Poem in Turkish: Must be in Turkish characters. You can add poet's name underneath but don't put the poem name on top of this section. The name you have put on #2 will appear on top of this.
5. Poem in English:
You can add poet's name underneath but don't put the poem name on top of this section. The name you have put on #3 will appear on top of this.
Add your name underneath the translation. Type: "Translated by yourname"

Here is an example:
http://www.turkishclass.com/poem_192

This is the additional criteria:

6. It must be translated by you.
7. You must not be inspired by another translation.
8. The original text must be the correct one and you must have taken it from a trustfull source. Many "I want to impress my girlfrind" type web sites son't have the correct versions and sometimes they have all the same incorrect versions as they tend to copy from one another.
9. Underneath the English translation you must have added a "Translated by yourname" section. You can type your real name or your nickname in this website.
10. The translation must be from Turkish to English. In other words, it must be a Turkish poem that you translate into English, not the other way.
11. If the poem you translated is already included among our translations it might still be added if it is not much worse than the existing one.
12. It must belong to a known figure and the poem must met certain esthetical criteria.
13. Your translation must met certain esthetical criteria.

There are many good translations on this forum but we can't just add them without the translators request and there are also those formal criteria mention above from #1-5.

edit: topic is not sticky anymore because of lack of interest but of course you can still post here as mentioned above.

Yes you can. It is not common because the "-meden" suffix already has a negative suffix -me and it will be negative + negative so it's not common but it is possible. Here is an example:

Dinlemeden konuşmamak gerekir.
Normal translation: One must not talk without listening.
Literal translation: It is necessary not to talk without listening.
gerekir: It is necessary
konuşmamak : not to talk
dinlemeden : without listening.

But instead the negative infinitive (konuşmamak) you could use the negative imperative (konuşma) and for sure this is more common. This is the main structure to use when you want to say "Don't do this without doing that."

Dinlemeden konuşma.
Don't talk without listening.

Bilmeden konuşma.
Don't talk without knowing.

Sütünü içmeden yatma.
Don't go to bed without drinking your milk.

Duş almadan havuza girmeyiniz.
Don't use the pool without taking a shower.

This will be corrected in the next update of winmekmak if I have time for it.

Last time I have corrected conjugation problems and now you see a warning that they are not recommended. I didn't have enough time to revise gerunds etc. It would have delayed the release too much.

You don't use -mezden but you use -meden. Ignore -mezden. It is an uneducated person's speech.

Incorrect: Siz gelmezden önce.
Correct: Siz gelmeden önce.