sürmüşlerdi

sürmüşlerdi

"They had driven" or "They had continued."

In this sentence, 'sürmüşlerdi' is used to describe an action that had been completed in the past, prior to another past event.

Onlar geçmişte uzun süre boyunca bu arabayı sürmüşlerdi.

They had driven this car for a long time in the past.

Here, 'sürmüşlerdi' connotes the continuation of an habitual action or process that was completed by a certain point in the past.

Bahçelerinde birçok ağaç yetiştirip hepsini düzenli olarak sulamayı sürmüşlerdi.

They had continued to regularly water all the trees they grew in their garden.

The use of 'sürmüşlerdi' in this context emphasizes a past action that showed persistence or constancy before being interrupted by another past event.

Ders çalışmayı bir alışkanlık haline getirmiş ve yıllarca öyle sürdüğünü sürmüşlerdi.

They had made studying a habit and had continued it regularly for years.