English verb conjugation
MUST PERCEIVE

Regular verb: perceive - perceived - perceived

Affirmation

Simple form	V-ing form
I must perceive you must perceive she must perceive we must perceive you must perceive they must perceive	I must be perceiving you must be perceiving she must be perceiving we must be perceiving you must be perceiving they must be perceiving
Perfect	V-ing perfect
I must have perceived you must have perceived she must have perceived we must have perceived you must have perceived they must have perceived	I must have been perceiving you must have been perceiving she must have been perceiving we must have been perceiving you must have been perceiving they must have been perceiving

Negation

Simple form	V-ing form
I must not perceive you must not perceive she must not perceive we must not perceive you must not perceive they must not perceive	I must not be perceiving you must not be perceiving she must not be perceiving we must not be perceiving you must not be perceiving they must not be perceiving
Perfect	V-ing perfect
I must not have perceived you must not have perceived she must not have perceived we must not have perceived you must not have perceived they must not have perceived	I must not have been perceiving you must not have been perceiving she must not have been perceiving we must not have been perceiving you must not have been perceiving they must not have been perceiving

Interrogative form

Simple form	V-ing form
must I perceive? must you perceive? must she perceive? must we perceive? must you perceive? must they perceive?	must I be perceiving? must you be perceiving? must she be perceiving? must we be perceiving? must you be perceiving? must they be perceiving?
Perfect	V-ing perfect
must I have perceived? must you have perceived? must she have perceived? must we have perceived? must you have perceived? must they have perceived?	must I have been perceiving? must you have been perceiving? must she have been perceiving? must we have been perceiving? must you have been perceiving? must they have been perceiving?

Interro-negative form

Simple form	V-ing form
must I not perceive? must you not perceive? must she not perceive? must we not perceive? must you not perceive? must they not perceive?	must I not be perceiving? must you not be perceiving? must she not be perceiving? must we not be perceiving? must you not be perceiving? must they not be perceiving?
Perfect	V-ing perfect
must I not have perceived? must you not have perceived? must she not have perceived? must we not have perceived? must you not have perceived? must they not have perceived?	must I not have been perceiving? must you not have been perceiving? must she not have been perceiving? must we not have been perceiving? must you not have been perceiving? must they not have been perceiving?