English verb conjugation
COULD ULTRACENTRIFUGE

Regular verb: ultracentrifuge - ultracentrifuged - ultracentrifuged

Affirmation

Simple form	V-ing form
I could ultracentrifuge you could ultracentrifuge she could ultracentrifuge we could ultracentrifuge you could ultracentrifuge they could ultracentrifuge	I could be ultracentrifuging you could be ultracentrifuging she could be ultracentrifuging we could be ultracentrifuging you could be ultracentrifuging they could be ultracentrifuging
Perfect	V-ing perfect
I could have ultracentrifuged you could have ultracentrifuged she could have ultracentrifuged we could have ultracentrifuged you could have ultracentrifuged they could have ultracentrifuged	I could have been ultracentrifuging you could have been ultracentrifuging she could have been ultracentrifuging we could have been ultracentrifuging you could have been ultracentrifuging they could have been ultracentrifuging

Negation

Simple form	V-ing form
I couldn't ultracentrifuge you couldn't ultracentrifuge she couldn't ultracentrifuge we couldn't ultracentrifuge you couldn't ultracentrifuge they couldn't ultracentrifuge	I couldn't be ultracentrifuging you couldn't be ultracentrifuging she couldn't be ultracentrifuging we couldn't be ultracentrifuging you couldn't be ultracentrifuging they couldn't be ultracentrifuging
Perfect	V-ing perfect
I couldn't have ultracentrifuged you couldn't have ultracentrifuged she couldn't have ultracentrifuged we couldn't have ultracentrifuged you couldn't have ultracentrifuged they couldn't have ultracentrifuged	I couldn't have been ultracentrifuging you couldn't have been ultracentrifuging she couldn't have been ultracentrifuging we couldn't have been ultracentrifuging you couldn't have been ultracentrifuging they couldn't have been ultracentrifuging

Interrogative form

Simple form	V-ing form
could I ultracentrifuge? could you ultracentrifuge? could she ultracentrifuge? could we ultracentrifuge? could you ultracentrifuge? could they ultracentrifuge?	could I be ultracentrifuging? could you be ultracentrifuging? could she be ultracentrifuging? could we be ultracentrifuging? could you be ultracentrifuging? could they be ultracentrifuging?
Perfect	V-ing perfect
could I have ultracentrifuged? could you have ultracentrifuged? could she have ultracentrifuged? could we have ultracentrifuged? could you have ultracentrifuged? could they have ultracentrifuged?	could I have been ultracentrifuging? could you have been ultracentrifuging? could she have been ultracentrifuging? could we have been ultracentrifuging? could you have been ultracentrifuging? could they have been ultracentrifuging?

Interro-negative form

Simple form	V-ing form
couldn't I ultracentrifuge? couldn't you ultracentrifuge? couldn't she ultracentrifuge? couldn't we ultracentrifuge? couldn't you ultracentrifuge? couldn't they ultracentrifuge?	couldn't I be ultracentrifuging? couldn't you be ultracentrifuging? couldn't she be ultracentrifuging? couldn't we be ultracentrifuging? couldn't you be ultracentrifuging? couldn't they be ultracentrifuging?
Perfect	V-ing perfect
couldn't I have ultracentrifuged? couldn't you have ultracentrifuged? couldn't she have ultracentrifuged? couldn't we have ultracentrifuged? couldn't you have ultracentrifuged? couldn't they have ultracentrifuged?	couldn't I have been ultracentrifuging? couldn't you have been ultracentrifuging? couldn't she have been ultracentrifuging? couldn't we have been ultracentrifuging? couldn't you have been ultracentrifuging? couldn't they have been ultracentrifuging?