could precheck
Verbo regular: precheck - prechecked- prechecked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could precheck
you could precheck
he could precheck
we could precheck
you could precheck
they could precheck 	I could be prechecking
you could be prechecking
he could be prechecking
we could be prechecking
you could be prechecking
they could be prechecking	I could have prechecked
you could have prechecked
he could have prechecked
we could have prechecked
you could have prechecked
they could have prechecked	I could have been prechecking
you could have been prechecking
he could have been prechecking
we could have been prechecking
you could have been prechecking
they could have been prechecking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not precheck
you could not precheck
he could not precheck
we could not precheck
you could not precheck
they could not precheck 	I could not be prechecking
you could not be prechecking
he could not be prechecking
we could not be prechecking
you could not be prechecking
they could not be prechecking	I could not have prechecked
you could not have prechecked
he could not have prechecked
we could not have prechecked
you could not have prechecked
they could not have prechecked	I could not have been prechecking
you could not have been prechecking
he could not have been prechecking
we could not have been prechecking
you could not have been prechecking
they could not have been prechecking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I precheck?
could you precheck?
could he precheck?
could we precheck?
could you precheck?
could they precheck? 	could I be prechecking?
could you be prechecking?
could he be prechecking?
could we be prechecking?
could you be prechecking?
could they be prechecking? 	could I have prechecked?
could you have prechecked?
could he have prechecked?
could we have prechecked?
could you have prechecked?
could they have prechecked? 	could I have been prechecking?
could you have been prechecking?
could he have been prechecking?
could we have been prechecking?
could you have been prechecking?
could they have been prechecking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not precheck?
could you not precheck?
could he not precheck?
could we not precheck?
could you not precheck?
could they not precheck? 	could I not be prechecking?
could you not be prechecking?
could he not be prechecking?
could we not be prechecking?
could you not be prechecking?
could they not be prechecking? 	could I not have prechecked?
could you not have prechecked?
could he not have prechecked?
could we not have prechecked?
could you not have prechecked?
could they not have prechecked? 	could I not have been prechecking?
could you not have been prechecking?
could he not have been prechecking?
could we not have been prechecking?
could you not have been prechecking?
could they not have been prechecking?