I can burl you can burl he can burl we can burl you can burl they can burl
V-ing form
I can be burling you can be burling he can be burling we can be burling you can be burling they can be burling
Perfect
I can have burled you can have burled he can have burled we can have burled you can have burled they can have burled
V-ing perfect
I can have been burling you can have been burling he can have been burling we can have been burling you can have been burling they can have been burling
Negation
Simple form
I can't burl you can't burl he can't burl we can't burl you can't burl they can't burl
V-ing form
I can't be burling you can't be burling he can't be burling we can't be burling you can't be burling they can't be burling
Perfect
I can't have burled you can't have burled he can't have burled we can't have burled you can't have burled they can't have burled
V-ing perfect
I can't have been burling you can't have been burling he can't have been burling we can't have been burling you can't have been burling they can't have been burling
Interrogative form
Simple form
can I burl? can you burl? can he burl? can we burl? can you burl? can they burl?
V-ing form
can I be burling? can you be burling? can he be burling? can we be burling? can you be burling? can they be burling?
Perfect
can I have burled? can you have burled? can he have burled? can we have burled? can you have burled? can they have burled?
V-ing perfect
can I have been burling? can you have been burling? can he have been burling? can we have been burling? can you have been burling? can they have been burling?
Interro-negative form
Simple form
can't I burl? can't you burl? can't he burl? can't we burl? can't you burl? can't they burl?
V-ing form
can't I be burling? can't you be burling? can't he be burling? can't we be burling? can't you be burling? can't they be burling?
Perfect
can't I have burled? can't you have burled? can't he have burled? can't we have burled? can't you have burled? can't they have burled?
V-ing perfect
can't I have been burling? can't you have been burling? can't he have been burling? can't we have been burling? can't you have been burling? can't they have been burling?