I must centrifuge you must centrifuge she must centrifuge we must centrifuge you must centrifuge they must centrifuge
V-ing form
I must be centrifuging you must be centrifuging she must be centrifuging we must be centrifuging you must be centrifuging they must be centrifuging
Perfect
I must have centrifuged you must have centrifuged she must have centrifuged we must have centrifuged you must have centrifuged they must have centrifuged
V-ing perfect
I must have been centrifuging you must have been centrifuging she must have been centrifuging we must have been centrifuging you must have been centrifuging they must have been centrifuging
Negation
Simple form
I must not centrifuge you must not centrifuge she must not centrifuge we must not centrifuge you must not centrifuge they must not centrifuge
V-ing form
I must not be centrifuging you must not be centrifuging she must not be centrifuging we must not be centrifuging you must not be centrifuging they must not be centrifuging
Perfect
I must not have centrifuged you must not have centrifuged she must not have centrifuged we must not have centrifuged you must not have centrifuged they must not have centrifuged
V-ing perfect
I must not have been centrifuging you must not have been centrifuging she must not have been centrifuging we must not have been centrifuging you must not have been centrifuging they must not have been centrifuging
Interrogative form
Simple form
must I centrifuge? must you centrifuge? must she centrifuge? must we centrifuge? must you centrifuge? must they centrifuge?
V-ing form
must I be centrifuging? must you be centrifuging? must she be centrifuging? must we be centrifuging? must you be centrifuging? must they be centrifuging?
Perfect
must I have centrifuged? must you have centrifuged? must she have centrifuged? must we have centrifuged? must you have centrifuged? must they have centrifuged?
V-ing perfect
must I have been centrifuging? must you have been centrifuging? must she have been centrifuging? must we have been centrifuging? must you have been centrifuging? must they have been centrifuging?
Interro-negative form
Simple form
must I not centrifuge? must you not centrifuge? must she not centrifuge? must we not centrifuge? must you not centrifuge? must they not centrifuge?
V-ing form
must I not be centrifuging? must you not be centrifuging? must she not be centrifuging? must we not be centrifuging? must you not be centrifuging? must they not be centrifuging?
Perfect
must I not have centrifuged? must you not have centrifuged? must she not have centrifuged? must we not have centrifuged? must you not have centrifuged? must they not have centrifuged?
V-ing perfect
must I not have been centrifuging? must you not have been centrifuging? must she not have been centrifuging? must we not have been centrifuging? must you not have been centrifuging? must they not have been centrifuging?