I must obtain you must obtain she must obtain we must obtain you must obtain they must obtain
V-ing form
I must be obtaining you must be obtaining she must be obtaining we must be obtaining you must be obtaining they must be obtaining
Perfect
I must have obtained you must have obtained she must have obtained we must have obtained you must have obtained they must have obtained
V-ing perfect
I must have been obtaining you must have been obtaining she must have been obtaining we must have been obtaining you must have been obtaining they must have been obtaining
Negation
Simple form
I must not obtain you must not obtain she must not obtain we must not obtain you must not obtain they must not obtain
V-ing form
I must not be obtaining you must not be obtaining she must not be obtaining we must not be obtaining you must not be obtaining they must not be obtaining
Perfect
I must not have obtained you must not have obtained she must not have obtained we must not have obtained you must not have obtained they must not have obtained
V-ing perfect
I must not have been obtaining you must not have been obtaining she must not have been obtaining we must not have been obtaining you must not have been obtaining they must not have been obtaining
Interrogative form
Simple form
must I obtain? must you obtain? must she obtain? must we obtain? must you obtain? must they obtain?
V-ing form
must I be obtaining? must you be obtaining? must she be obtaining? must we be obtaining? must you be obtaining? must they be obtaining?
Perfect
must I have obtained? must you have obtained? must she have obtained? must we have obtained? must you have obtained? must they have obtained?
V-ing perfect
must I have been obtaining? must you have been obtaining? must she have been obtaining? must we have been obtaining? must you have been obtaining? must they have been obtaining?
Interro-negative form
Simple form
must I not obtain? must you not obtain? must she not obtain? must we not obtain? must you not obtain? must they not obtain?
V-ing form
must I not be obtaining? must you not be obtaining? must she not be obtaining? must we not be obtaining? must you not be obtaining? must they not be obtaining?
Perfect
must I not have obtained? must you not have obtained? must she not have obtained? must we not have obtained? must you not have obtained? must they not have obtained?
V-ing perfect
must I not have been obtaining? must you not have been obtaining? must she not have been obtaining? must we not have been obtaining? must you not have been obtaining? must they not have been obtaining?