English verb conjugation
CAN REGRET

Regular verb: regret - regreted - regreted

Affirmation

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

Negation

Simple form	V-ing form
I can't regret you can't regret he can't regret we can't regret you can't regret they can't regret	I can't be regreting you can't be regreting he can't be regreting we can't be regreting you can't be regreting they can't be regreting
Perfect	V-ing perfect
I can't have regreted you can't have regreted he can't have regreted we can't have regreted you can't have regreted they can't have regreted	I can't have been regreting you can't have been regreting he can't have been regreting we can't have been regreting you can't have been regreting they can't have been regreting

Interrogative form

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

Interro-negative form

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