could tusk
Verbe régulier : tusk - tusked- tusked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could tusk
you could tusk
he could tusk
we could tusk
you could tusk
they could tusk 	I could be tusking
you could be tusking
he could be tusking
we could be tusking
you could be tusking
they could be tusking	I could have tusked
you could have tusked
he could have tusked
we could have tusked
you could have tusked
they could have tusked	I could have been tusking
you could have been tusking
he could have been tusking
we could have been tusking
you could have been tusking
they could have been tusking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't tusk
you couldn't tusk
he couldn't tusk
we couldn't tusk
you couldn't tusk
they couldn't tusk 	I couldn't be tusking
you couldn't be tusking
he couldn't be tusking
we couldn't be tusking
you couldn't be tusking
they couldn't be tusking	I couldn't have tusked
you couldn't have tusked
he couldn't have tusked
we couldn't have tusked
you couldn't have tusked
they couldn't have tusked	I couldn't have been tusking
you couldn't have been tusking
he couldn't have been tusking
we couldn't have been tusking
you couldn't have been tusking
they couldn't have been tusking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I tusk?
could you tusk?
could he tusk?
could we tusk?
could you tusk?
could they tusk? 	could I be tusking?
could you be tusking?
could he be tusking?
could we be tusking?
could you be tusking?
could they be tusking? 	could I have tusked?
could you have tusked?
could he have tusked?
could we have tusked?
could you have tusked?
could they have tusked? 	could I have been tusking?
could you have been tusking?
could he have been tusking?
could we have been tusking?
could you have been tusking?
could they have been tusking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I tusk?
couldn't you tusk?
couldn't he tusk?
couldn't we tusk?
couldn't you tusk?
couldn't they tusk? 	couldn't I be tusking?
couldn't you be tusking?
couldn't he be tusking?
couldn't we be tusking?
couldn't you be tusking?
couldn't they be tusking? 	couldn't I have tusked?
couldn't you have tusked?
couldn't he have tusked?
couldn't we have tusked?
couldn't you have tusked?
couldn't they have tusked? 	couldn't I have been tusking?
couldn't you have been tusking?
couldn't he have been tusking?
couldn't we have been tusking?
couldn't you have been tusking?
couldn't they have been tusking?