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 couldn't burl you couldn't burl he couldn't burl we couldn't burl you couldn't burl they couldn't burl	I couldn't be burling you couldn't be burling he couldn't be burling we couldn't be burling you couldn't be burling they couldn't be burling
Perfect	V-ing perfect
I couldn't have burled you couldn't have burled he couldn't have burled we couldn't have burled you couldn't have burled they couldn't have burled	I couldn't have been burling you couldn't have been burling he couldn't have been burling we couldn't have been burling you couldn't have been burling they couldn't 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
couldn't I burl? couldn't you burl? couldn't he burl? couldn't we burl? couldn't you burl? couldn't they burl?	couldn't I be burling? couldn't you be burling? couldn't he be burling? couldn't we be burling? couldn't you be burling? couldn't they be burling?
Perfect	V-ing perfect
couldn't I have burled? couldn't you have burled? couldn't he have burled? couldn't we have burled? couldn't you have burled? couldn't they have burled?	couldn't I have been burling? couldn't you have been burling? couldn't he have been burling? couldn't we have been burling? couldn't you have been burling? couldn't they have been burling?