Should have + past participle
Use should have + past participle to make judgments about the past.
Here you will find a list of sentences using this pattern. Of course you can convert them into the negative form, shouldn’t have.
I know I should have called, but I was tied up at a meeting.
I’m exhausted. I shouldn’t have gone to bed so late.
I should have listened a long time ago. . . .
I should have invited my husband to join me…
I should have been happy.
I should have sought medical advice.
I should have had a happy childhood.
I should have done a better job.
I should have acted treacherously.
I should have realized the danger at the beginning.
I should have perished in my affliction.
I should have written to my own parents.
I should have finished college.
I should have bought that coat.
I should have left.
I should have done it sooner.
I should have waited.
I should have killed you.
A famous quotation:
It is fitting that we should have buried the Unknown Prime Minister [Bonar Law] by the side of the Unknown Soldier.
In Robert Blake The Unknown Prime Minister (1955) p. 531