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 must not suffix you must not suffix he must not suffix we must not suffix you must not suffix they must not suffix	I must not be suffixing you must not be suffixing he must not be suffixing we must not be suffixing you must not be suffixing they must not be suffixing
Perfect	V-ing perfect
I must not have suffixed you must not have suffixed he must not have suffixed we must not have suffixed you must not have suffixed they must not have suffixed	I must not have been suffixing you must not have been suffixing he must not have been suffixing we must not have been suffixing you must not have been suffixing they must not 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
must I not suffix? must you not suffix? must he not suffix? must we not suffix? must you not suffix? must they not suffix?	must I not be suffixing? must you not be suffixing? must he not be suffixing? must we not be suffixing? must you not be suffixing? must they not be suffixing?
Perfect	V-ing perfect
must I not have suffixed? must you not have suffixed? must he not have suffixed? must we not have suffixed? must you not have suffixed? must they not have suffixed?	must I not have been suffixing? must you not have been suffixing? must he not have been suffixing? must we not have been suffixing? must you not have been suffixing? must they not have been suffixing?