Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I should regret regret you should regret regret she should regret regret we should regret regret you should regret regret they should regret regret
V-ing form
I should be regret regreting you should be regret regreting she should be regret regreting we should be regret regreting you should be regret regreting they should be regret regreting
Perfect
I should have regret regreted you should have regret regreted she should have regret regreted we should have regret regreted you should have regret regreted they should have regret regreted
V-ing perfect
I should have been regret regreting you should have been regret regreting she should have been regret regreting we should have been regret regreting you should have been regret regreting they should have been regret regreting
Negation
Simple form
I should not regret regret you should not regret regret she should not regret regret we should not regret regret you should not regret regret they should not regret regret
V-ing form
I should not be regret regreting you should not be regret regreting she should not be regret regreting we should not be regret regreting you should not be regret regreting they should not be regret regreting
Perfect
I should not have regret regreted you should not have regret regreted she should not have regret regreted we should not have regret regreted you should not have regret regreted they should not have regret regreted
V-ing perfect
I should not have been regret regreting you should not have been regret regreting she should not have been regret regreting we should not have been regret regreting you should not have been regret regreting they should not have been regret regreting
Interrogative form
Simple form
should I regret regret? should you regret regret? should she regret regret? should we regret regret? should you regret regret? should they regret regret?
V-ing form
should I be regret regreting? should you be regret regreting? should she be regret regreting? should we be regret regreting? should you be regret regreting? should they be regret regreting?
Perfect
should I have regret regreted? should you have regret regreted? should she have regret regreted? should we have regret regreted? should you have regret regreted? should they have regret regreted?
V-ing perfect
should I have been regret regreting? should you have been regret regreting? should she have been regret regreting? should we have been regret regreting? should you have been regret regreting? should they have been regret regreting?
Interro-negative form
Simple form
should I not regret regret? should you not regret regret? should she not regret regret? should we not regret regret? should you not regret regret? should they not regret regret?
V-ing form
should I not be regret regreting? should you not be regret regreting? should she not be regret regreting? should we not be regret regreting? should you not be regret regreting? should they not be regret regreting?
Perfect
should I not have regret regreted? should you not have regret regreted? should she not have regret regreted? should we not have regret regreted? should you not have regret regreted? should they not have regret regreted?
V-ing perfect
should I not have been regret regreting? should you not have been regret regreting? should she not have been regret regreting? should we not have been regret regreting? should you not have been regret regreting? should they not have been regret regreting?