I could birl you could birl he could birl we could birl you could birl they could birl
Forme en V-ing
I could be birling you could be birling he could be birling we could be birling you could be birling they could be birling
Perfect
I could have birled you could have birled he could have birled we could have birled you could have birled they could have birled
Perfect en V-ing
I could have been birling you could have been birling he could have been birling we could have been birling you could have been birling they could have been birling
Négation
Forme simple
I couldn't birl you couldn't birl he couldn't birl we couldn't birl you couldn't birl they couldn't birl
Forme en V-ing
I couldn't be birling you couldn't be birling he couldn't be birling we couldn't be birling you couldn't be birling they couldn't be birling
Perfect
I couldn't have birled you couldn't have birled he couldn't have birled we couldn't have birled you couldn't have birled they couldn't have birled
Perfect en V-ing
I couldn't have been birling you couldn't have been birling he couldn't have been birling we couldn't have been birling you couldn't have been birling they couldn't have been birling
Forme interrogative
Forme simple
could I birl? could you birl? could he birl? could we birl? could you birl? could they birl?
Forme en V-ing
could I be birling? could you be birling? could he be birling? could we be birling? could you be birling? could they be birling?
Perfect
could I have birled? could you have birled? could he have birled? could we have birled? could you have birled? could they have birled?
Perfect en V-ing
could I have been birling? could you have been birling? could he have been birling? could we have been birling? could you have been birling? could they have been birling?
Forme interro-négative
Forme simple
couldn't I birl? couldn't you birl? couldn't he birl? couldn't we birl? couldn't you birl? couldn't they birl?
Forme en V-ing
couldn't I be birling? couldn't you be birling? couldn't he be birling? couldn't we be birling? couldn't you be birling? couldn't they be birling?
Perfect
couldn't I have birled? couldn't you have birled? couldn't he have birled? couldn't we have birled? couldn't you have birled? couldn't they have birled?
Perfect en V-ing
couldn't I have been birling? couldn't you have been birling? couldn't he have been birling? couldn't we have been birling? couldn't you have been birling? couldn't they have been birling?