English verb conjugation
MUST SUFFIX

Regular verb: suffix - suffixed - suffixed

Affirmation

Simple form	V-ing form
I must suffix you must suffix he must suffix we must suffix you must suffix they must suffix	I must be suffixing you must be suffixing he must be suffixing we must be suffixing you must be suffixing they must be suffixing
Perfect	V-ing perfect
I must have suffixed you must have suffixed he must have suffixed we must have suffixed you must have suffixed they must have suffixed	I must have been suffixing you must have been suffixing he must have been suffixing we must have been suffixing you must have been suffixing they must have been suffixing

Negation

Simple form	V-ing form
I mustn't suffix you mustn't suffix he mustn't suffix we mustn't suffix you mustn't suffix they mustn't suffix	I mustn't be suffixing you mustn't be suffixing he mustn't be suffixing we mustn't be suffixing you mustn't be suffixing they mustn't be suffixing
Perfect	V-ing perfect
I mustn't have suffixed you mustn't have suffixed he mustn't have suffixed we mustn't have suffixed you mustn't have suffixed they mustn't have suffixed	I mustn't have been suffixing you mustn't have been suffixing he mustn't have been suffixing we mustn't have been suffixing you mustn't have been suffixing they mustn't have been suffixing

Interrogative form

Simple form	V-ing form
must I suffix? must you suffix? must he suffix? must we suffix? must you suffix? must they suffix?	must I be suffixing? must you be suffixing? must he be suffixing? must we be suffixing? must you be suffixing? must they be suffixing?
Perfect	V-ing perfect
must I have suffixed? must you have suffixed? must he have suffixed? must we have suffixed? must you have suffixed? must they have suffixed?	must I have been suffixing? must you have been suffixing? must he have been suffixing? must we have been suffixing? must you have been suffixing? must they have been suffixing?

Interro-negative form

Simple form	V-ing form
mustn't I suffix? mustn't you suffix? mustn't he suffix? mustn't we suffix? mustn't you suffix? mustn't they suffix?	mustn't I be suffixing? mustn't you be suffixing? mustn't he be suffixing? mustn't we be suffixing? mustn't you be suffixing? mustn't they be suffixing?
Perfect	V-ing perfect
mustn't I have suffixed? mustn't you have suffixed? mustn't he have suffixed? mustn't we have suffixed? mustn't you have suffixed? mustn't they have suffixed?	mustn't I have been suffixing? mustn't you have been suffixing? mustn't he have been suffixing? mustn't we have been suffixing? mustn't you have been suffixing? mustn't they have been suffixing?