could flunk
Verbo regular: flunk - flunked- flunked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could flunk
you could flunk
he could flunk
we could flunk
you could flunk
they could flunk 	I could be flunking
you could be flunking
he could be flunking
we could be flunking
you could be flunking
they could be flunking	I could have flunked
you could have flunked
he 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
he could have been flunking
we could have been flunking
you could have been flunking
they could have been flunking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not flunk
you could not flunk
he could not flunk
we could not flunk
you could not flunk
they could not flunk 	I could not be flunking
you could not be flunking
he could not be flunking
we could not be flunking
you could not be flunking
they could not be flunking	I could not have flunked
you could not have flunked
he could not have flunked
we could not have flunked
you could not have flunked
they could not have flunked	I could not have been flunking
you could not have been flunking
he could not have been flunking
we could not have been flunking
you could not have been flunking
they could not have been flunking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I flunk?
could you flunk?
could he flunk?
could we flunk?
could you flunk?
could they flunk? 	could I be flunking?
could you be flunking?
could he be flunking?
could we be flunking?
could you be flunking?
could they be flunking? 	could I have flunked?
could you have flunked?
could he 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 he have been flunking?
could we have been flunking?
could you have been flunking?
could they have been flunking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not flunk?
could you not flunk?
could he not flunk?
could we not flunk?
could you not flunk?
could they not flunk? 	could I not be flunking?
could you not be flunking?
could he not be flunking?
could we not be flunking?
could you not be flunking?
could they not be flunking? 	could I not have flunked?
could you not have flunked?
could he not have flunked?
could we not have flunked?
could you not have flunked?
could they not have flunked? 	could I not have been flunking?
could you not have been flunking?
could he not have been flunking?
could we not have been flunking?
could you not have been flunking?
could they not have been flunking?