English verb conjugation
COULD REGRET

Regular verb: regret - regreted - regreted

Affirmation

Simple form	V-ing form
I could regret you could regret he could regret we could regret you could regret they could regret	I could be regreting you could be regreting he could be regreting we could be regreting you could be regreting they could be regreting
Perfect	V-ing perfect
I could have regreted you could have regreted he could have regreted we could have regreted you could have regreted they could have regreted	I could have been regreting you could have been regreting he could have been regreting we could have been regreting you could have been regreting they could have been regreting

Negation

Simple form	V-ing form
I could not regret you could not regret he could not regret we could not regret you could not regret they could not regret	I could not be regreting you could not be regreting he could not be regreting we could not be regreting you could not be regreting they could not be regreting
Perfect	V-ing perfect
I could not have regreted you could not have regreted he could not have regreted we could not have regreted you could not have regreted they could not have regreted	I could not have been regreting you could not have been regreting he could not have been regreting we could not have been regreting you could not have been regreting they could not have been regreting

Interrogative form

Simple form	V-ing form
could I regret? could you regret? could he regret? could we regret? could you regret? could they regret?	could I be regreting? could you be regreting? could he be regreting? could we be regreting? could you be regreting? could they be regreting?
Perfect	V-ing perfect
could I have regreted? could you have regreted? could he have regreted? could we have regreted? could you have regreted? could they have regreted?	could I have been regreting? could you have been regreting? could he have been regreting? could we have been regreting? could you have been regreting? could they have been regreting?

Interro-negative form

Simple form	V-ing form
could I not regret? could you not regret? could he not regret? could we not regret? could you not regret? could they not regret?	could I not be regreting? could you not be regreting? could he not be regreting? could we not be regreting? could you not be regreting? could they not be regreting?
Perfect	V-ing perfect
could I not have regreted? could you not have regreted? could he not have regreted? could we not have regreted? could you not have regreted? could they not have regreted?	could I not have been regreting? could you not have been regreting? could he not have been regreting? could we not have been regreting? could you not have been regreting? could they not have been regreting?