could preclean
Verbo regular: preclean - precleaned- precleaned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could preclean
you could preclean
she could preclean
we could preclean
you could preclean
they could preclean 	I could be precleaning
you could be precleaning
she could be precleaning
we could be precleaning
you could be precleaning
they could be precleaning	I could have precleaned
you could have precleaned
she 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
she could have been precleaning
we could have been precleaning
you could have been precleaning
they could have been precleaning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not preclean
you could not preclean
she 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
she 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
she 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
she 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 com V-ing 	Perfeito 	Perfeito com V-ing 	
could I preclean?
could you preclean?
could she preclean?
could we preclean?
could you preclean?
could they preclean? 	could I be precleaning?
could you be precleaning?
could she be precleaning?
could we be precleaning?
could you be precleaning?
could they be precleaning? 	could I have precleaned?
could you have precleaned?
could she 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 she have been precleaning?
could we have been precleaning?
could you have been precleaning?
could they have been precleaning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not preclean?
could you not preclean?
could she 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 she 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 she 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 she not have been precleaning?
could we not have been precleaning?
could you not have been precleaning?
could they not have been precleaning?