could shirk
Verbo regular: shirk - shirked- shirked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shirk
you could shirk
he could shirk
we could shirk
you could shirk
they could shirk 	I could be shirking
you could be shirking
he could be shirking
we could be shirking
you could be shirking
they could be shirking	I could have shirked
you could have shirked
he could have shirked
we could have shirked
you could have shirked
they could have shirked	I could have been shirking
you could have been shirking
he could have been shirking
we could have been shirking
you could have been shirking
they could have been shirking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not shirk
you could not shirk
he could not shirk
we could not shirk
you could not shirk
they could not shirk 	I could not be shirking
you could not be shirking
he could not be shirking
we could not be shirking
you could not be shirking
they could not be shirking	I could not have shirked
you could not have shirked
he could not have shirked
we could not have shirked
you could not have shirked
they could not have shirked	I could not have been shirking
you could not have been shirking
he could not have been shirking
we could not have been shirking
you could not have been shirking
they could not have been shirking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shirk?
could you shirk?
could he shirk?
could we shirk?
could you shirk?
could they shirk? 	could I be shirking?
could you be shirking?
could he be shirking?
could we be shirking?
could you be shirking?
could they be shirking? 	could I have shirked?
could you have shirked?
could he have shirked?
could we have shirked?
could you have shirked?
could they have shirked? 	could I have been shirking?
could you have been shirking?
could he have been shirking?
could we have been shirking?
could you have been shirking?
could they have been shirking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not shirk?
could you not shirk?
could he not shirk?
could we not shirk?
could you not shirk?
could they not shirk? 	could I not be shirking?
could you not be shirking?
could he not be shirking?
could we not be shirking?
could you not be shirking?
could they not be shirking? 	could I not have shirked?
could you not have shirked?
could he not have shirked?
could we not have shirked?
could you not have shirked?
could they not have shirked? 	could I not have been shirking?
could you not have been shirking?
could he not have been shirking?
could we not have been shirking?
could you not have been shirking?
could they not have been shirking?