す可(べ)きshould do (abbr. of suru+beki), ought to do

私(わたし)は運動(うんどう)不足(ぶそく)を改善(かいぜん)すべきだ。

I should improve my lack of exercise. {should do (abbr. of suru+beki), ought to do}

全(すべ)ての学生(がくせい)は全力(ぜんりょく)で勉強(べんきょう)をす可(べ)きである。

All students should study with all their might. {should do (abbr. of suru+beki), ought to do}

読解(どっかい)力(りょく)を上(あ)げるためには読書(どくしょ)をすべきです。

In order to improve reading comprehension, you should read books. {should do (abbr. of suru+beki), ought to do}

未成年(みせいねん)ならいざ知(し)らず、成人(せいじん)なら仕事(しごと)をして稼(かせ)いで自立(じりつ)す可(べ)きだ。

It's one thing if they're minors, but if they're adults, they should work and earn their own living. {should do (abbr. of suru+beki), ought to do}

定期(ていき)的(てき)に運動(うんどう)をすべきだと知(し)ってはいるものの、それがなかなかに難(むずか)しい。

Although I know that I should regularly exercise, it is quite difficult. {should do (abbr. of suru+beki), ought to do}