10課 〜したほうがいい・〜なさい 教科書 p.46
Should〜 / Let〜
接続：V辞書形 + べきだ／べきではない
should / shouldn't. State a stronger obligation or standard than ほうがいい.
注意 / Note：Check the subject, tense and tone of both clauses; Avoid translating word for word from Vietnamese.
比較 / Compare：Compare with similar samples in the same article to choose according to nuance and connection. Same 課: 命令(しろ)／禁止(〜な)／〜こと／〜たらどうか — these models are often mistaken for each other, read the 接続 line carefully and then decide.
約束は守るべきです。
You should keep your promise.
人を見た目で判断すべきではありません。
Don't judge people by appearance.
若いうちに経験しておくべきです。
You should accumulate experience when you are young.