English verb conjugation
COULD PRECLEAN

Regular verb: preclean - precleaned - precleaned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?