could flunk
Verbe régulier : flunk - flunked- flunked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could flunk
you could flunk
she could flunk
we could flunk
you could flunk
they could flunk 	I could be flunking
you could be flunking
she could be flunking
we could be flunking
you could be flunking
they could be flunking	I could have flunked
you could have flunked
she could have flunked
we could have flunked
you could have flunked
they could have flunked	I could have been flunking
you could have been flunking
she could have been flunking
we could have been flunking
you could have been flunking
they could have been flunking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't flunk
you couldn't flunk
she couldn't flunk
we couldn't flunk
you couldn't flunk
they couldn't flunk 	I couldn't be flunking
you couldn't be flunking
she couldn't be flunking
we couldn't be flunking
you couldn't be flunking
they couldn't be flunking	I couldn't have flunked
you couldn't have flunked
she couldn't have flunked
we couldn't have flunked
you couldn't have flunked
they couldn't have flunked	I couldn't have been flunking
you couldn't have been flunking
she couldn't have been flunking
we couldn't have been flunking
you couldn't have been flunking
they couldn't have been flunking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I flunk?
could you flunk?
could she flunk?
could we flunk?
could you flunk?
could they flunk? 	could I be flunking?
could you be flunking?
could she be flunking?
could we be flunking?
could you be flunking?
could they be flunking? 	could I have flunked?
could you have flunked?
could she have flunked?
could we have flunked?
could you have flunked?
could they have flunked? 	could I have been flunking?
could you have been flunking?
could she have been flunking?
could we have been flunking?
could you have been flunking?
could they have been flunking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I flunk?
couldn't you flunk?
couldn't she flunk?
couldn't we flunk?
couldn't you flunk?
couldn't they flunk? 	couldn't I be flunking?
couldn't you be flunking?
couldn't she be flunking?
couldn't we be flunking?
couldn't you be flunking?
couldn't they be flunking? 	couldn't I have flunked?
couldn't you have flunked?
couldn't she have flunked?
couldn't we have flunked?
couldn't you have flunked?
couldn't they have flunked? 	couldn't I have been flunking?
couldn't you have been flunking?
couldn't she have been flunking?
couldn't we have been flunking?
couldn't you have been flunking?
couldn't they have been flunking?