Ben bu koyu renkli ceketi deniyorum.

Yes. In Turkish, the ending -um in deniyorum already tells you the subject is I.

So Ben bu koyu renkli ceketi deniyorum and Bu koyu renkli ceketi deniyorum can both mean the same thing.

ben is often added for:

• emphasis
• contrast
• clarity

For example, Ben deniyorum, o almıyor = I’m trying it on, but he/she isn’t buying it.

Turkish usually prefers Subject + Object + Verb word order, while English usually uses Subject + Verb + Object.

So in this sentence:

• Ben = subject
• bu koyu renkli ceketi = object
• deniyorum = verb

That is why the verb comes at the end.

Turkish word order is also fairly flexible, but the verb very often stays last.

Because ceketi is the definite direct object form.

The noun ceket takes the accusative ending -i:

• ceket = jacket
• ceketi = the jacket / this specific jacket as the object

In Turkish, when the direct object is specific or definite, it usually takes the accusative ending.

Here, the jacket is specific because it is identified by bu koyu renkli = this dark-colored.

Compare:

• Bir ceket deniyorum. = I’m trying on a jacket.
• Bu ceketi deniyorum. = I’m trying on this jacket.

bu means this.

It comes before the noun phrase, just like in English:

• bu ceket = this jacket
• bu koyu renkli ceket = this dark-colored jacket

Turkish demonstratives commonly are:

• bu = this
• şu = that / this there
• o = that

koyu renkli is an adjective phrase describing the jacket.

Breakdown:

• koyu = dark, deep
• renkli = colored, having color

Together, koyu renkli means something like:

• dark-colored
• of a dark color

It is a very natural Turkish way to describe color.

So:

• koyu renkli ceket = dark-colored jacket

The suffix -li / -lı / -lu / -lü often means with, having, or characterized by.

So:

• renk = color
• renkli = colored / with color

Some similar examples:

• tuz = salt → tuzlu = salty
• şeker = sugar → şekerli = sugary / with sugar
• sis = fog → sisli = foggy

In koyu renkli, renkli helps make the phrase sound like dark-colored rather than just dark.

It comes from the verb denemek.

Here is the structure:

• verb stem: dene-
• present continuous suffix: -iyor
• 1st person singular ending: -um

So:

• dene- + -iyor + -um
• becomes deniyorum

This means I am trying or, in the context of clothes, I am trying on.

Because when the Turkish present continuous suffix -iyor is added to a verb stem ending in a vowel, that final vowel usually drops.

So:

• dene- + -iyor → deniyor
• then deniyor + um → deniyorum

This happens with many vowel-final stems.

For example:

• anla- → anlıyorum
• bekle- → bekliyorum
• dene- → deniyorum

So the form is regular once you know this rule.

Yes. denemek can mean:

• to try
• to test
• to try on

The exact meaning depends on context.

With clothing, it commonly means to try on:

• ceket denemek = to try on a jacket
• ayakkabı denemek = to try on shoes

So in this sentence, deniyorum is naturally understood as I’m trying it on.

Yes. It is one full noun phrase functioning as the direct object.

Its parts are:

• bu = this
• koyu renkli = dark-colored
• ceketi = the jacket (object form)

Together:

• bu koyu renkli ceketi = this dark-colored jacket

A useful pattern to notice is that in Turkish, modifiers usually come before the noun:

• bu before the adjective phrase
• adjective phrase before ceket
• case ending attached to the noun at the end

Yes, absolutely.

You can say:

• Bu koyu renkli ceketi deniyorum.

This is very natural Turkish because the verb ending already shows the subject is I.

You usually add ben only when:

• you want emphasis
• you are contrasting with someone else
• you want to sound extra clear

So both are correct, but the version without ben is often more neutral in everyday speech.