Okulda İngilizce öğrenmek zorunda kaldığımda zaman zaman tüm düzensizlik ve garip kurallardan yakınırdım. - When I had to learn English in school, at times I would bemoan all the irregularities and strange rules.
If you bemoan something, you express sorrow or dissatisfaction about it. Universities and other research establishments bemoan their lack of funds. = lament. to complain or say that you are disappointed about something