はずであった
I should have done that.
Had intended to do
The matter is settled.
I had no alternative but to do so.
I should have done so too.
I should have had it.
しなきゃよかったな。
買い物をしなければならなかった。
I had to shop.
残っていた
去ったあと
You should really have done it (for) yourself.
I should have said.
I should have been careful!
できました
I shouldn't have done that kind of thing.