English verb conjugation
MUST REQUIRE

Regular verb: require - required - required

Affirmation

Simple form	V-ing form
I must require you must require he must require we must require you must require they must require	I must be requiring you must be requiring he must be requiring we must be requiring you must be requiring they must be requiring
Perfect	V-ing perfect
I must have required you must have required he must have required we must have required you must have required they must have required	I must have been requiring you must have been requiring he must have been requiring we must have been requiring you must have been requiring they must have been requiring

Negation

Simple form	V-ing form
I must not require you must not require he must not require we must not require you must not require they must not require	I must not be requiring you must not be requiring he must not be requiring we must not be requiring you must not be requiring they must not be requiring
Perfect	V-ing perfect
I must not have required you must not have required he must not have required we must not have required you must not have required they must not have required	I must not have been requiring you must not have been requiring he must not have been requiring we must not have been requiring you must not have been requiring they must not have been requiring

Interrogative form

Simple form	V-ing form
must I require? must you require? must he require? must we require? must you require? must they require?	must I be requiring? must you be requiring? must he be requiring? must we be requiring? must you be requiring? must they be requiring?
Perfect	V-ing perfect
must I have required? must you have required? must he have required? must we have required? must you have required? must they have required?	must I have been requiring? must you have been requiring? must he have been requiring? must we have been requiring? must you have been requiring? must they have been requiring?

Interro-negative form

Simple form	V-ing form
must I not require? must you not require? must he not require? must we not require? must you not require? must they not require?	must I not be requiring? must you not be requiring? must he not be requiring? must we not be requiring? must you not be requiring? must they not be requiring?
Perfect	V-ing perfect
must I not have required? must you not have required? must he not have required? must we not have required? must you not have required? must they not have required?	must I not have been requiring? must you not have been requiring? must he not have been requiring? must we not have been requiring? must you not have been requiring? must they not have been requiring?