could countercheck
Verbo regular: countercheck - counterchecked- counterchecked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could countercheck
you could countercheck
he could countercheck
we could countercheck
you could countercheck
they could countercheck 	I could be counterchecking
you could be counterchecking
he could be counterchecking
we could be counterchecking
you could be counterchecking
they could be counterchecking	I could have counterchecked
you could have counterchecked
he could have counterchecked
we could have counterchecked
you could have counterchecked
they could have counterchecked	I could have been counterchecking
you could have been counterchecking
he could have been counterchecking
we could have been counterchecking
you could have been counterchecking
they could have been counterchecking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not countercheck
you could not countercheck
he could not countercheck
we could not countercheck
you could not countercheck
they could not countercheck 	I could not be counterchecking
you could not be counterchecking
he could not be counterchecking
we could not be counterchecking
you could not be counterchecking
they could not be counterchecking	I could not have counterchecked
you could not have counterchecked
he could not have counterchecked
we could not have counterchecked
you could not have counterchecked
they could not have counterchecked	I could not have been counterchecking
you could not have been counterchecking
he could not have been counterchecking
we could not have been counterchecking
you could not have been counterchecking
they could not have been counterchecking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I countercheck?
could you countercheck?
could he countercheck?
could we countercheck?
could you countercheck?
could they countercheck? 	could I be counterchecking?
could you be counterchecking?
could he be counterchecking?
could we be counterchecking?
could you be counterchecking?
could they be counterchecking? 	could I have counterchecked?
could you have counterchecked?
could he have counterchecked?
could we have counterchecked?
could you have counterchecked?
could they have counterchecked? 	could I have been counterchecking?
could you have been counterchecking?
could he have been counterchecking?
could we have been counterchecking?
could you have been counterchecking?
could they have been counterchecking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not countercheck?
could you not countercheck?
could he not countercheck?
could we not countercheck?
could you not countercheck?
could they not countercheck? 	could I not be counterchecking?
could you not be counterchecking?
could he not be counterchecking?
could we not be counterchecking?
could you not be counterchecking?
could they not be counterchecking? 	could I not have counterchecked?
could you not have counterchecked?
could he not have counterchecked?
could we not have counterchecked?
could you not have counterchecked?
could they not have counterchecked? 	could I not have been counterchecking?
could you not have been counterchecking?
could he not have been counterchecking?
could we not have been counterchecking?
could you not have been counterchecking?
could they not have been counterchecking?