English verb conjugation
MUST PURCHASE

Regular verb: purchase - purchased - purchased

Affirmation

Simple form	V-ing form
I must purchase you must purchase he must purchase we must purchase you must purchase they must purchase	I must be purchasing you must be purchasing he must be purchasing we must be purchasing you must be purchasing they must be purchasing
Perfect	V-ing perfect
I must have purchased you must have purchased he must have purchased we must have purchased you must have purchased they must have purchased	I must have been purchasing you must have been purchasing he must have been purchasing we must have been purchasing you must have been purchasing they must have been purchasing

Negation

Simple form	V-ing form
I mustn't purchase you mustn't purchase he mustn't purchase we mustn't purchase you mustn't purchase they mustn't purchase	I mustn't be purchasing you mustn't be purchasing he mustn't be purchasing we mustn't be purchasing you mustn't be purchasing they mustn't be purchasing
Perfect	V-ing perfect
I mustn't have purchased you mustn't have purchased he mustn't have purchased we mustn't have purchased you mustn't have purchased they mustn't have purchased	I mustn't have been purchasing you mustn't have been purchasing he mustn't have been purchasing we mustn't have been purchasing you mustn't have been purchasing they mustn't have been purchasing

Interrogative form

Simple form	V-ing form
must I purchase? must you purchase? must he purchase? must we purchase? must you purchase? must they purchase?	must I be purchasing? must you be purchasing? must he be purchasing? must we be purchasing? must you be purchasing? must they be purchasing?
Perfect	V-ing perfect
must I have purchased? must you have purchased? must he have purchased? must we have purchased? must you have purchased? must they have purchased?	must I have been purchasing? must you have been purchasing? must he have been purchasing? must we have been purchasing? must you have been purchasing? must they have been purchasing?

Interro-negative form

Simple form	V-ing form
mustn't I purchase? mustn't you purchase? mustn't he purchase? mustn't we purchase? mustn't you purchase? mustn't they purchase?	mustn't I be purchasing? mustn't you be purchasing? mustn't he be purchasing? mustn't we be purchasing? mustn't you be purchasing? mustn't they be purchasing?
Perfect	V-ing perfect
mustn't I have purchased? mustn't you have purchased? mustn't he have purchased? mustn't we have purchased? mustn't you have purchased? mustn't they have purchased?	mustn't I have been purchasing? mustn't you have been purchasing? mustn't he have been purchasing? mustn't we have been purchasing? mustn't you have been purchasing? mustn't they have been purchasing?