English verb conjugation
MUST OBTAIN

Regular verb: obtain - obtained - obtained

Affirmation

Simple form	V-ing form
I must obtain you must obtain he must obtain we must obtain you must obtain they must obtain	I must be obtaining you must be obtaining he must be obtaining we must be obtaining you must be obtaining they must be obtaining
Perfect	V-ing perfect
I must have obtained you must have obtained he must have obtained we must have obtained you must have obtained they must have obtained	I must have been obtaining you must have been obtaining he must have been obtaining we must have been obtaining you must have been obtaining they must have been obtaining

Negation

Simple form	V-ing form
I must not obtain you must not obtain he must not obtain we must not obtain you must not obtain they must not obtain	I must not be obtaining you must not be obtaining he must not be obtaining we must not be obtaining you must not be obtaining they must not be obtaining
Perfect	V-ing perfect
I must not have obtained you must not have obtained he must not have obtained we must not have obtained you must not have obtained they must not have obtained	I must not have been obtaining you must not have been obtaining he 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	V-ing form
must I obtain? must you obtain? must he obtain? must we obtain? must you obtain? must they obtain?	must I be obtaining? must you be obtaining? must he be obtaining? must we be obtaining? must you be obtaining? must they be obtaining?
Perfect	V-ing perfect
must I have obtained? must you have obtained? must he have obtained? must we have obtained? must you have obtained? must they have obtained?	must I have been obtaining? must you have been obtaining? must he have been obtaining? must we have been obtaining? must you have been obtaining? must they have been obtaining?

Interro-negative form

Simple form	V-ing form
must I not obtain? must you not obtain? must he not obtain? must we not obtain? must you not obtain? must they not obtain?	must I not be obtaining? must you not be obtaining? must he not be obtaining? must we not be obtaining? must you not be obtaining? must they not be obtaining?
Perfect	V-ing perfect
must I not have obtained? must you not have obtained? must he not have obtained? must we not have obtained? must you not have obtained? must they not have obtained?	must I not have been obtaining? must you not have been obtaining? must he not have been obtaining? must we not have been obtaining? must you not have been obtaining? must they not have been obtaining?