English verb conjugation
COULD BURL

Regular verb: burl - burled - burled

Affirmation

Simple form	V-ing form
I could burl you could burl he could burl we could burl you could burl they could burl	I could be burling you could be burling he could be burling we could be burling you could be burling they could be burling
Perfect	V-ing perfect
I could have burled you could have burled he could have burled we could have burled you could have burled they could have burled	I could have been burling you could have been burling he could have been burling we could have been burling you could have been burling they could have been burling

Negation

Simple form	V-ing form
I could not burl you could not burl he could not burl we could not burl you could not burl they could not burl	I could not be burling you could not be burling he could not be burling we could not be burling you could not be burling they could not be burling
Perfect	V-ing perfect
I could not have burled you could not have burled he could not have burled we could not have burled you could not have burled they could not have burled	I could not have been burling you could not have been burling he could not have been burling we could not have been burling you could not have been burling they could not have been burling

Interrogative form

Simple form	V-ing form
could I burl? could you burl? could he burl? could we burl? could you burl? could they burl?	could I be burling? could you be burling? could he be burling? could we be burling? could you be burling? could they be burling?
Perfect	V-ing perfect
could I have burled? could you have burled? could he have burled? could we have burled? could you have burled? could they have burled?	could I have been burling? could you have been burling? could he have been burling? could we have been burling? could you have been burling? could they have been burling?

Interro-negative form

Simple form	V-ing form
could I not burl? could you not burl? could he not burl? could we not burl? could you not burl? could they not burl?	could I not be burling? could you not be burling? could he not be burling? could we not be burling? could you not be burling? could they not be burling?
Perfect	V-ing perfect
could I not have burled? could you not have burled? could he not have burled? could we not have burled? could you not have burled? could they not have burled?	could I not have been burling? could you not have been burling? could he not have been burling? could we not have been burling? could you not have been burling? could they not have been burling?