Explanation
Express an obligation or something that should be done (mainly with verbs).
Formation
Verb-dictionary form + べきだ
Detailed explanation
The ～べきだ grammar point is used to express a sense of obligation or to indicate something that should be done. In modern Japanese, it is almost always used with verbs in the dictionary form. In English, it can be translated as 'should' or 'ought to'.
Examples
勉強するべきだ。
Benkyou suru beki da.
You should study.
早く寝るべきだ。
Hayaku neru beki da.
You should sleep early.
静かにするべきだ。
Shizuka ni suru beki da.
You should be quiet.
彼に謝るべきだ。
Kare ni ayamaru beki da.
You should apologize to him.
Practice
Grammar content sourced from hanabira.org.