元となった辞書の項目
だ
verb
to be / should; be obliged to; ought to / です follows i-adjectives, as the standard polite terminal form for i-adjectives.
意味（1）
to be
意味（2）
should; be obliged to; ought to
意味（3）
です follows i-adjectives, as the standard polite terminal form for i-adjectives.
意味（4）
だろう / でしょう / なら can follow any inflectable word, forming suppletive volitional/polite volitional/conditional forms.
意味（5）
(auxiliary) Not following any words, but used before some conjunctives or in some inflected forms, to represent the aforementioned statement.
