English verb conjugation
MUST UMPIRE

Regular verb: umpire - umpired - umpired

Affirmation

Simple form	V-ing form
I must umpire you must umpire he must umpire we must umpire you must umpire they must umpire	I must be umpiring you must be umpiring he must be umpiring we must be umpiring you must be umpiring they must be umpiring
Perfect	V-ing perfect
I must have umpired you must have umpired he must have umpired we must have umpired you must have umpired they must have umpired	I must have been umpiring you must have been umpiring he must have been umpiring we must have been umpiring you must have been umpiring they must have been umpiring

Negation

Simple form	V-ing form
I must not umpire you must not umpire he must not umpire we must not umpire you must not umpire they must not umpire	I must not be umpiring you must not be umpiring he must not be umpiring we must not be umpiring you must not be umpiring they must not be umpiring
Perfect	V-ing perfect
I must not have umpired you must not have umpired he must not have umpired we must not have umpired you must not have umpired they must not have umpired	I must not have been umpiring you must not have been umpiring he must not have been umpiring we must not have been umpiring you must not have been umpiring they must not have been umpiring

Interrogative form

Simple form	V-ing form
must I umpire? must you umpire? must he umpire? must we umpire? must you umpire? must they umpire?	must I be umpiring? must you be umpiring? must he be umpiring? must we be umpiring? must you be umpiring? must they be umpiring?
Perfect	V-ing perfect
must I have umpired? must you have umpired? must he have umpired? must we have umpired? must you have umpired? must they have umpired?	must I have been umpiring? must you have been umpiring? must he have been umpiring? must we have been umpiring? must you have been umpiring? must they have been umpiring?

Interro-negative form

Simple form	V-ing form
must I not umpire? must you not umpire? must he not umpire? must we not umpire? must you not umpire? must they not umpire?	must I not be umpiring? must you not be umpiring? must he not be umpiring? must we not be umpiring? must you not be umpiring? must they not be umpiring?
Perfect	V-ing perfect
must I not have umpired? must you not have umpired? must he not have umpired? must we not have umpired? must you not have umpired? must they not have umpired?	must I not have been umpiring? must you not have been umpiring? must he not have been umpiring? must we not have been umpiring? must you not have been umpiring? must they not have been umpiring?