Learn Turkish: Harabenin paslanmış kapıları kilitli. - The rusted doors of the ruin are locked.

It is the verb paslanmak (to rust) turned into an adjective using the -mış suffix. This suffix takes a completed past action and turns it into a description. Since the doors have already rusted, they are now paslanmış (rusted).

How is the word paslanmış built from its root?

It starts with the noun pas (rust). The suffix -lan turns it into the verb paslanmak (to get rusty). Finally, the -mış suffix changes that verb into the adjective we see here.

Can we put an adjective directly inside a noun compound like harabenin kapıları?

Yes! Harabenin kapıları is a definite noun compound meaning 'the ruin's doors'. When you want to describe the possessed noun (the doors), the adjective goes right before it. That is why paslanmış sits between the two words of the compound.

Why is 'locked' translated as kilitli instead of using a verb form?

Kilit is the noun for 'lock' and the -li suffix means 'having' or 'with'. Turkish frequently uses this pattern to describe a state. Kilitli literally means 'with a lock', which is the standard and most natural way to describe a locked door.