This is the 6038th most frequent Turkish word.
yapmalı
"Yapmalı" means "should do" or "must do" in English.
'Etmemeli' originates from 'etmek' (to do) in its negative form 'etme-' combined with the necessity suffix '-malı', creating a negative necessity phrasing for a general subject.
Egzersizi ihmal etmemeli.
One should not neglect exercise.
'Bulmalıyız' is derived from the root 'bulmak' (to find) combined with the necessity suffix '-malı' and the personal suffix '-yız', indicating the necessity of action for the subject 'we'.
Bu problemi çözmek için bir yol bulmalıyız.
We must find a way to solve this problem.
'Olmalısınız' uses the root 'olmak' (to be) with the necessity suffix '-malı' and the second person plural/formal suffix '-sınız', conveying a suggestion or advice.