kaf

ك

The Arabic letter kaf can appear in four different forms: isolated, initial, medial and final.

finalmedialinitialisolated
ـكـكـكـك

When you show the letter on its own, you use the isolated form.

ك

When the letter is the first letter of a word, you use the initial form.

كـ

For example these words:

bag
kiis
كِيس
cup
ka's
كَأس
every
kull
كُلّ

When the letter is not the first and not the last but somewhere in the middle of a word, you use the medial form in most cases.

ـكـ

For example these words:

referee
Hakam
حَكَم
verdict
Hukm
حُكم
opposite
3aks
عَكس

When the letter is the last letter of a word, you use the final form in most cases.

ـك

For example these words:

doubt
shakk
شَكّ
cock
diik
دِيك
king
malik
مَلِك

Now you know that:

In most cases...
Let us look at the other cases!

The letter kaf has dual joining, like most Arabic letters. It wants to join with both the letter before it and the letter after it.
But some letters has right joining. They only want to join with the letter before it (which is the letter to the right since Arabic is written from right to left).

When the letter is in the middle of a word, and follows a right joining letter, you use the initial form.

كـ
running
rikD
رِكض
food
'akl
أَكل

When the letter is the last letter of a word, and follows a right joining letter, you use the isolated form.

ك

Now you know that:

That's it!
The rules you just learned can be applied to all Arabic letters with dual joining, which is most of them.

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