English verb conjugation
MUST INQUIRE

Regular verb: inquire - inquired - inquired

Affirmation

Simple form	V-ing form
I must inquire you must inquire she must inquire we must inquire you must inquire they must inquire	I must be inquiring you must be inquiring she must be inquiring we must be inquiring you must be inquiring they must be inquiring
Perfect	V-ing perfect
I must have inquired you must have inquired she must have inquired we must have inquired you must have inquired they must have inquired	I must have been inquiring you must have been inquiring she must have been inquiring we must have been inquiring you must have been inquiring they must have been inquiring

Negation

Simple form	V-ing form
I must not inquire you must not inquire she must not inquire we must not inquire you must not inquire they must not inquire	I must not be inquiring you must not be inquiring she must not be inquiring we must not be inquiring you must not be inquiring they must not be inquiring
Perfect	V-ing perfect
I must not have inquired you must not have inquired she must not have inquired we must not have inquired you must not have inquired they must not have inquired	I must not have been inquiring you must not have been inquiring she must not have been inquiring we must not have been inquiring you must not have been inquiring they must not have been inquiring

Interrogative form

Simple form	V-ing form
must I inquire? must you inquire? must she inquire? must we inquire? must you inquire? must they inquire?	must I be inquiring? must you be inquiring? must she be inquiring? must we be inquiring? must you be inquiring? must they be inquiring?
Perfect	V-ing perfect
must I have inquired? must you have inquired? must she have inquired? must we have inquired? must you have inquired? must they have inquired?	must I have been inquiring? must you have been inquiring? must she have been inquiring? must we have been inquiring? must you have been inquiring? must they have been inquiring?

Interro-negative form

Simple form	V-ing form
must I not inquire? must you not inquire? must she not inquire? must we not inquire? must you not inquire? must they not inquire?	must I not be inquiring? must you not be inquiring? must she not be inquiring? must we not be inquiring? must you not be inquiring? must they not be inquiring?
Perfect	V-ing perfect
must I not have inquired? must you not have inquired? must she not have inquired? must we not have inquired? must you not have inquired? must they not have inquired?	must I not have been inquiring? must you not have been inquiring? must she not have been inquiring? must we not have been inquiring? must you not have been inquiring? must they not have been inquiring?