could preclean
Verbo regular: preclean - precleaned- precleaned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could preclean
you could preclean
he could preclean
we could preclean
you could preclean
they could preclean 	I could be precleaning
you could be precleaning
he could be precleaning
we could be precleaning
you could be precleaning
they could be precleaning	I could have precleaned
you could have precleaned
he could have precleaned
we could have precleaned
you could have precleaned
they could have precleaned	I could have been precleaning
you could have been precleaning
he could have been precleaning
we could have been precleaning
you could have been precleaning
they could have been precleaning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not preclean
you could not preclean
he could not preclean
we could not preclean
you could not preclean
they could not preclean 	I could not be precleaning
you could not be precleaning
he could not be precleaning
we could not be precleaning
you could not be precleaning
they could not be precleaning	I could not have precleaned
you could not have precleaned
he could not have precleaned
we could not have precleaned
you could not have precleaned
they could not have precleaned	I could not have been precleaning
you could not have been precleaning
he could not have been precleaning
we could not have been precleaning
you could not have been precleaning
they could not have been precleaning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I preclean?
could you preclean?
could he preclean?
could we preclean?
could you preclean?
could they preclean? 	could I be precleaning?
could you be precleaning?
could he be precleaning?
could we be precleaning?
could you be precleaning?
could they be precleaning? 	could I have precleaned?
could you have precleaned?
could he have precleaned?
could we have precleaned?
could you have precleaned?
could they have precleaned? 	could I have been precleaning?
could you have been precleaning?
could he have been precleaning?
could we have been precleaning?
could you have been precleaning?
could they have been precleaning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not preclean?
could you not preclean?
could he not preclean?
could we not preclean?
could you not preclean?
could they not preclean? 	could I not be precleaning?
could you not be precleaning?
could he not be precleaning?
could we not be precleaning?
could you not be precleaning?
could they not be precleaning? 	could I not have precleaned?
could you not have precleaned?
could he not have precleaned?
could we not have precleaned?
could you not have precleaned?
could they not have precleaned? 	could I not have been precleaning?
could you not have been precleaning?
could he not have been precleaning?
could we not have been precleaning?
could you not have been precleaning?
could they not have been precleaning?