Arkadaşımı cesaretlendirebilmek için ona destek veriyorum.

Because arkadaşımı is the definite direct object of cesaretlendirebilmek.

Breakdown:

• arkadaş = friend
• arkadaşım = my friend
• arkadaşımı = my friend (as a definite/specific object)

So in this sentence, arkadaşımı cesaretlendirebilmek means to be able to encourage my friend.

A useful point: in Turkish, even an infinitive like cesaretlendirebilmek can take its own object.

They can refer to the same person, but they have different grammatical roles.

• arkadaşımı = the person being encouraged
• ona = the person to whom I give support

So Turkish is showing the roles for two different verb ideas:

• encourage my friend
• give support to him/her

This may feel slightly repetitive in English, but it is normal for Turkish to mark each role clearly. In context, one part could sometimes be omitted, but the full sentence is grammatical and clear.

It is a long verb form made of several parts:

• cesaret = courage
• cesaretlendirmek = to encourage
• cesaretlendirebilmek = to be able to encourage

More specifically:

• -ebil- adds the meaning of be able to / can
• -mek makes it an infinitive: to ...

So:

• cesaretlendirmek = to encourage
• cesaretlendirebilmek = to be able to encourage

As a learner, it is often easiest to remember cesaretlendirmek as a whole verb meaning to encourage, and then notice that -ebilmek adds ability/possibility.

Because Turkish normally puts the object before the verb, and that also applies when the verb is an infinitive.

So:

• arkadaşımı cesaretlendirebilmek = to be able to encourage my friend

This is the normal Turkish order.

Compare:

• kitap okumak = to read a book
• kitabı okumak = to read the book

In Turkish, the object usually comes first, not after the verb as in English.

Here için means for or, more naturally in this pattern, in order to.

The pattern is:

• verb + -mek / -mak + için = in order to ...

So:

• cesaretlendirebilmek için = in order to be able to encourage

This is a very common way to express purpose in Turkish.

Examples:

• Öğrenmek için çalışıyorum. = I study in order to learn.
• Yetişmek için koşuyorum. = I’m running in order to make it / catch up.

Because destek vermek uses the dative case, not the accusative.

• o = he / she / it
• ona = to him / her
• onu = him / her (direct object)

The expression is:

• birine destek vermek = to give support to someone

So:

• ona destek veriyorum = I am giving support to him/her

If you used onu, that would treat the person as a direct object, but destek vermek normally takes a dative recipient.

Because destek vermek is a very common Turkish expression, literally to give support.

Turkish often uses a noun + light verb combination:

• destek vermek = to support
• yardım etmek = to help
• karar vermek = to decide

There is also a one-word verb:

• desteklemek = to support

So both of these are possible:

• ona destek veriyorum
• onu destekliyorum

They are close in meaning. The sentence you have uses the very common collocation destek vermek.

Veriyorum is the present continuous form.

Breakdown:

• ver- = give
• -iyor = present continuous
• -um = I

So:

• veriyorum = I am giving

In Turkish, this form is used not only for something happening right now, but also for an ongoing present situation. So here it can feel like:

• I am supporting him/her
• I’m giving him/her support

depending on context.

-ebilmek adds the idea of ability or possibility.

Compare:

• cesaretlendirmek için = in order to encourage
• cesaretlendirebilmek için = in order to be able to encourage

So the version with -ebilmek suggests:

• I am doing this so that I can encourage my friend
• I am creating the conditions that make encouragement possible

In English, we often translate this more naturally rather than word-for-word, but the Turkish form clearly includes that extra meaning of being able to.

The sentence uses a very normal Turkish word order, but Turkish word order is somewhat flexible.

This version is natural because it goes roughly like this:

• purpose clause: Arkadaşımı cesaretlendirebilmek için
• indirect object: ona
• main verb: destek veriyorum

The final verb position is especially important in Turkish. Other parts can move for emphasis, but this sentence already sounds natural and neutral.