English verb conjugation
COULD PRESTERILIZE

Regular verb: presterilize - presterilized - presterilized

Affirmation

Simple form	V-ing form
I could presterilize you could presterilize he could presterilize we could presterilize you could presterilize they could presterilize	I could be presterilizing you could be presterilizing he could be presterilizing we could be presterilizing you could be presterilizing they could be presterilizing
Perfect	V-ing perfect
I could have presterilized you could have presterilized he could have presterilized we could have presterilized you could have presterilized they could have presterilized	I could have been presterilizing you could have been presterilizing he could have been presterilizing we could have been presterilizing you could have been presterilizing they could have been presterilizing

Negation

Simple form	V-ing form
I couldn't presterilize you couldn't presterilize he couldn't presterilize we couldn't presterilize you couldn't presterilize they couldn't presterilize	I couldn't be presterilizing you couldn't be presterilizing he couldn't be presterilizing we couldn't be presterilizing you couldn't be presterilizing they couldn't be presterilizing
Perfect	V-ing perfect
I couldn't have presterilized you couldn't have presterilized he couldn't have presterilized we couldn't have presterilized you couldn't have presterilized they couldn't have presterilized	I couldn't have been presterilizing you couldn't have been presterilizing he couldn't have been presterilizing we couldn't have been presterilizing you couldn't have been presterilizing they couldn't have been presterilizing

Interrogative form

Simple form	V-ing form
could I presterilize? could you presterilize? could he presterilize? could we presterilize? could you presterilize? could they presterilize?	could I be presterilizing? could you be presterilizing? could he be presterilizing? could we be presterilizing? could you be presterilizing? could they be presterilizing?
Perfect	V-ing perfect
could I have presterilized? could you have presterilized? could he have presterilized? could we have presterilized? could you have presterilized? could they have presterilized?	could I have been presterilizing? could you have been presterilizing? could he have been presterilizing? could we have been presterilizing? could you have been presterilizing? could they have been presterilizing?

Interro-negative form

Simple form	V-ing form
couldn't I presterilize? couldn't you presterilize? couldn't he presterilize? couldn't we presterilize? couldn't you presterilize? couldn't they presterilize?	couldn't I be presterilizing? couldn't you be presterilizing? couldn't he be presterilizing? couldn't we be presterilizing? couldn't you be presterilizing? couldn't they be presterilizing?
Perfect	V-ing perfect
couldn't I have presterilized? couldn't you have presterilized? couldn't he have presterilized? couldn't we have presterilized? couldn't you have presterilized? couldn't they have presterilized?	couldn't I have been presterilizing? couldn't you have been presterilizing? couldn't he have been presterilizing? couldn't we have been presterilizing? couldn't you have been presterilizing? couldn't they have been presterilizing?