I must amass you must amass she must amass we must amass you must amass they must amass
V-ing form
I must be amassing you must be amassing she must be amassing we must be amassing you must be amassing they must be amassing
Perfect
I must have amassed you must have amassed she must have amassed we must have amassed you must have amassed they must have amassed
V-ing perfect
I must have been amassing you must have been amassing she must have been amassing we must have been amassing you must have been amassing they must have been amassing
Negation
Simple form
I must not amass you must not amass she must not amass we must not amass you must not amass they must not amass
V-ing form
I must not be amassing you must not be amassing she must not be amassing we must not be amassing you must not be amassing they must not be amassing
Perfect
I must not have amassed you must not have amassed she must not have amassed we must not have amassed you must not have amassed they must not have amassed
V-ing perfect
I must not have been amassing you must not have been amassing she must not have been amassing we must not have been amassing you must not have been amassing they must not have been amassing
Interrogative form
Simple form
must I amass? must you amass? must she amass? must we amass? must you amass? must they amass?
V-ing form
must I be amassing? must you be amassing? must she be amassing? must we be amassing? must you be amassing? must they be amassing?
Perfect
must I have amassed? must you have amassed? must she have amassed? must we have amassed? must you have amassed? must they have amassed?
V-ing perfect
must I have been amassing? must you have been amassing? must she have been amassing? must we have been amassing? must you have been amassing? must they have been amassing?
Interro-negative form
Simple form
must I not amass? must you not amass? must she not amass? must we not amass? must you not amass? must they not amass?
V-ing form
must I not be amassing? must you not be amassing? must she not be amassing? must we not be amassing? must you not be amassing? must they not be amassing?
Perfect
must I not have amassed? must you not have amassed? must she not have amassed? must we not have amassed? must you not have amassed? must they not have amassed?
V-ing perfect
must I not have been amassing? must you not have been amassing? must she not have been amassing? must we not have been amassing? must you not have been amassing? must they not have been amassing?