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 couldn't preclean you couldn't preclean he couldn't preclean we couldn't preclean you couldn't preclean they couldn't preclean	I couldn't be precleaning you couldn't be precleaning he couldn't be precleaning we couldn't be precleaning you couldn't be precleaning they couldn't be precleaning
Perfect	V-ing perfect
I couldn't have precleaned you couldn't have precleaned he couldn't have precleaned we couldn't have precleaned you couldn't have precleaned they couldn't have precleaned	I couldn't have been precleaning you couldn't have been precleaning he couldn't have been precleaning we couldn't have been precleaning you couldn't have been precleaning they couldn't 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
couldn't I preclean? couldn't you preclean? couldn't he preclean? couldn't we preclean? couldn't you preclean? couldn't they preclean?	couldn't I be precleaning? couldn't you be precleaning? couldn't he be precleaning? couldn't we be precleaning? couldn't you be precleaning? couldn't they be precleaning?
Perfect	V-ing perfect
couldn't I have precleaned? couldn't you have precleaned? couldn't he have precleaned? couldn't we have precleaned? couldn't you have precleaned? couldn't they have precleaned?	couldn't I have been precleaning? couldn't you have been precleaning? couldn't he have been precleaning? couldn't we have been precleaning? couldn't you have been precleaning? couldn't they have been precleaning?