oturmuştu

oturmuştu

"Had sat" or "was sitting" (past perfect or past continuous tense of the verb "sit").

Here, 'oturmuştu' indicates a completed past action, focusing on the result of Ahmet’s action of sitting.

Ahmet çok sakin bir şekilde sandalyeye oturmuştu.

Ahmet had sat on the chair very calmly.

In this instance, 'oturmuştu' emphasizes the state of everyone being seated in the garden during a past time frame.

O günlerde, mahalledeki herkes bahçede oturmuştu.

In those days, everyone in the neighborhood had been sitting in the garden.

Here, 'oturmuştu' signifies that the act of sitting was completed before another past event (beginning of rain) occurred.

Yağmur yağmaya başladığında, o çoktan koltukta oturmuştu.

By the time it started to rain, she/he had already sat on the couch.