ought

すべきだ

何をするのが正しいか、または最もよいかを表す。

やさしい英語で： Used to say what is the right or best thing to do.

• You ought to rest.
• We ought to help our neighbours.
• He ought to have checked the address before leaving.

使い方： ought to + verb (You ought to call your mother.); ought not to + verb (We ought not to waste food.); ought to have + past participle (I ought to have thanked her sooner.)

類義語： should

よく使う表現： ought to help, ought to know, ought to apologize

はずだ

あることが起こる、または正しいと予想されることを表す。

やさしい英語で： Used to say that something is likely or expected to happen or be true.

• The bus ought to arrive soon.
• That amount ought to be enough for everyone.
• They ought to have finished the repairs by now.

使い方： ought to + verb (This key ought to fit the lock.); ought to have + past participle (The parcel ought to have arrived yesterday.)

類義語： should

よく使う表現： ought to arrive, ought to be ready, ought to work