English verb conjugation
MUST PERCEIVE

Regular verb: perceive - perceived - perceived

Affirmation

Simple form	V-ing form
I must perceive you must perceive he must perceive we must perceive you must perceive they must perceive	I must be perceiving you must be perceiving he 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 he 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 he 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 mustn't perceive you mustn't perceive he mustn't perceive we mustn't perceive you mustn't perceive they mustn't perceive	I mustn't be perceiving you mustn't be perceiving he mustn't be perceiving we mustn't be perceiving you mustn't be perceiving they mustn't be perceiving
Perfect	V-ing perfect
I mustn't have perceived you mustn't have perceived he mustn't have perceived we mustn't have perceived you mustn't have perceived they mustn't have perceived	I mustn't have been perceiving you mustn't have been perceiving he mustn't have been perceiving we mustn't have been perceiving you mustn't have been perceiving they mustn't have been perceiving

Interrogative form

Simple form	V-ing form
must I perceive? must you perceive? must he perceive? must we perceive? must you perceive? must they perceive?	must I be perceiving? must you be perceiving? must he 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 he 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 he 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
mustn't I perceive? mustn't you perceive? mustn't he perceive? mustn't we perceive? mustn't you perceive? mustn't they perceive?	mustn't I be perceiving? mustn't you be perceiving? mustn't he be perceiving? mustn't we be perceiving? mustn't you be perceiving? mustn't they be perceiving?
Perfect	V-ing perfect
mustn't I have perceived? mustn't you have perceived? mustn't he have perceived? mustn't we have perceived? mustn't you have perceived? mustn't they have perceived?	mustn't I have been perceiving? mustn't you have been perceiving? mustn't he have been perceiving? mustn't we have been perceiving? mustn't you have been perceiving? mustn't they have been perceiving?