English verb conjugation
COULD FOSSILIZE

Regular verb: fossilize - fossilized - fossilized

Affirmation

Simple form	V-ing form
I could fossilize you could fossilize he could fossilize we could fossilize you could fossilize they could fossilize	I could be fossilizing you could be fossilizing he could be fossilizing we could be fossilizing you could be fossilizing they could be fossilizing
Perfect	V-ing perfect
I could have fossilized you could have fossilized he could have fossilized we could have fossilized you could have fossilized they could have fossilized	I could have been fossilizing you could have been fossilizing he could have been fossilizing we could have been fossilizing you could have been fossilizing they could have been fossilizing

Negation

Simple form	V-ing form
I couldn't fossilize you couldn't fossilize he couldn't fossilize we couldn't fossilize you couldn't fossilize they couldn't fossilize	I couldn't be fossilizing you couldn't be fossilizing he couldn't be fossilizing we couldn't be fossilizing you couldn't be fossilizing they couldn't be fossilizing
Perfect	V-ing perfect
I couldn't have fossilized you couldn't have fossilized he couldn't have fossilized we couldn't have fossilized you couldn't have fossilized they couldn't have fossilized	I couldn't have been fossilizing you couldn't have been fossilizing he couldn't have been fossilizing we couldn't have been fossilizing you couldn't have been fossilizing they couldn't have been fossilizing

Interrogative form

Simple form	V-ing form
could I fossilize? could you fossilize? could he fossilize? could we fossilize? could you fossilize? could they fossilize?	could I be fossilizing? could you be fossilizing? could he be fossilizing? could we be fossilizing? could you be fossilizing? could they be fossilizing?
Perfect	V-ing perfect
could I have fossilized? could you have fossilized? could he have fossilized? could we have fossilized? could you have fossilized? could they have fossilized?	could I have been fossilizing? could you have been fossilizing? could he have been fossilizing? could we have been fossilizing? could you have been fossilizing? could they have been fossilizing?

Interro-negative form

Simple form	V-ing form
couldn't I fossilize? couldn't you fossilize? couldn't he fossilize? couldn't we fossilize? couldn't you fossilize? couldn't they fossilize?	couldn't I be fossilizing? couldn't you be fossilizing? couldn't he be fossilizing? couldn't we be fossilizing? couldn't you be fossilizing? couldn't they be fossilizing?
Perfect	V-ing perfect
couldn't I have fossilized? couldn't you have fossilized? couldn't he have fossilized? couldn't we have fossilized? couldn't you have fossilized? couldn't they have fossilized?	couldn't I have been fossilizing? couldn't you have been fossilizing? couldn't he have been fossilizing? couldn't we have been fossilizing? couldn't you have been fossilizing? couldn't they have been fossilizing?