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 couldn't regret you couldn't regret he couldn't regret we couldn't regret you couldn't regret they couldn't regret	I couldn't be regreting you couldn't be regreting he couldn't be regreting we couldn't be regreting you couldn't be regreting they couldn't be regreting
Perfect	V-ing perfect
I couldn't have regreted you couldn't have regreted he couldn't have regreted we couldn't have regreted you couldn't have regreted they couldn't have regreted	I couldn't have been regreting you couldn't have been regreting he couldn't have been regreting we couldn't have been regreting you couldn't have been regreting they couldn't 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
couldn't I regret? couldn't you regret? couldn't he regret? couldn't we regret? couldn't you regret? couldn't they regret?	couldn't I be regreting? couldn't you be regreting? couldn't he be regreting? couldn't we be regreting? couldn't you be regreting? couldn't they be regreting?
Perfect	V-ing perfect
couldn't I have regreted? couldn't you have regreted? couldn't he have regreted? couldn't we have regreted? couldn't you have regreted? couldn't they have regreted?	couldn't I have been regreting? couldn't you have been regreting? couldn't he have been regreting? couldn't we have been regreting? couldn't you have been regreting? couldn't they have been regreting?