English verb conjugation
MUST QUARTERBACK

Regular verb: quarterback - quarterbacked - quarterbacked

Affirmation

Simple form	V-ing form
I must quarterback you must quarterback he must quarterback we must quarterback you must quarterback they must quarterback	I must be quarterbacking you must be quarterbacking he must be quarterbacking we must be quarterbacking you must be quarterbacking they must be quarterbacking
Perfect	V-ing perfect
I must have quarterbacked you must have quarterbacked he must have quarterbacked we must have quarterbacked you must have quarterbacked they must have quarterbacked	I must have been quarterbacking you must have been quarterbacking he must have been quarterbacking we must have been quarterbacking you must have been quarterbacking they must have been quarterbacking

Negation

Simple form	V-ing form
I mustn't quarterback you mustn't quarterback he mustn't quarterback we mustn't quarterback you mustn't quarterback they mustn't quarterback	I mustn't be quarterbacking you mustn't be quarterbacking he mustn't be quarterbacking we mustn't be quarterbacking you mustn't be quarterbacking they mustn't be quarterbacking
Perfect	V-ing perfect
I mustn't have quarterbacked you mustn't have quarterbacked he mustn't have quarterbacked we mustn't have quarterbacked you mustn't have quarterbacked they mustn't have quarterbacked	I mustn't have been quarterbacking you mustn't have been quarterbacking he mustn't have been quarterbacking we mustn't have been quarterbacking you mustn't have been quarterbacking they mustn't have been quarterbacking

Interrogative form

Simple form	V-ing form
must I quarterback? must you quarterback? must he quarterback? must we quarterback? must you quarterback? must they quarterback?	must I be quarterbacking? must you be quarterbacking? must he be quarterbacking? must we be quarterbacking? must you be quarterbacking? must they be quarterbacking?
Perfect	V-ing perfect
must I have quarterbacked? must you have quarterbacked? must he have quarterbacked? must we have quarterbacked? must you have quarterbacked? must they have quarterbacked?	must I have been quarterbacking? must you have been quarterbacking? must he have been quarterbacking? must we have been quarterbacking? must you have been quarterbacking? must they have been quarterbacking?

Interro-negative form

Simple form	V-ing form
mustn't I quarterback? mustn't you quarterback? mustn't he quarterback? mustn't we quarterback? mustn't you quarterback? mustn't they quarterback?	mustn't I be quarterbacking? mustn't you be quarterbacking? mustn't he be quarterbacking? mustn't we be quarterbacking? mustn't you be quarterbacking? mustn't they be quarterbacking?
Perfect	V-ing perfect
mustn't I have quarterbacked? mustn't you have quarterbacked? mustn't he have quarterbacked? mustn't we have quarterbacked? mustn't you have quarterbacked? mustn't they have quarterbacked?	mustn't I have been quarterbacking? mustn't you have been quarterbacking? mustn't he have been quarterbacking? mustn't we have been quarterbacking? mustn't you have been quarterbacking? mustn't they have been quarterbacking?