English verb conjugation
MUST FIX

Regular verb: fix - fixed - fixed

Affirmation

Simple form	V-ing form
I must fix you must fix he must fix we must fix you must fix they must fix	I must be fixing you must be fixing he must be fixing we must be fixing you must be fixing they must be fixing
Perfect	V-ing perfect
I must have fixed you must have fixed he must have fixed we must have fixed you must have fixed they must have fixed	I must have been fixing you must have been fixing he must have been fixing we must have been fixing you must have been fixing they must have been fixing

Negation

Simple form	V-ing form
I mustn't fix you mustn't fix he mustn't fix we mustn't fix you mustn't fix they mustn't fix	I mustn't be fixing you mustn't be fixing he mustn't be fixing we mustn't be fixing you mustn't be fixing they mustn't be fixing
Perfect	V-ing perfect
I mustn't have fixed you mustn't have fixed he mustn't have fixed we mustn't have fixed you mustn't have fixed they mustn't have fixed	I mustn't have been fixing you mustn't have been fixing he mustn't have been fixing we mustn't have been fixing you mustn't have been fixing they mustn't have been fixing

Interrogative form

Simple form	V-ing form
must I fix? must you fix? must he fix? must we fix? must you fix? must they fix?	must I be fixing? must you be fixing? must he be fixing? must we be fixing? must you be fixing? must they be fixing?
Perfect	V-ing perfect
must I have fixed? must you have fixed? must he have fixed? must we have fixed? must you have fixed? must they have fixed?	must I have been fixing? must you have been fixing? must he have been fixing? must we have been fixing? must you have been fixing? must they have been fixing?

Interro-negative form

Simple form	V-ing form
mustn't I fix? mustn't you fix? mustn't he fix? mustn't we fix? mustn't you fix? mustn't they fix?	mustn't I be fixing? mustn't you be fixing? mustn't he be fixing? mustn't we be fixing? mustn't you be fixing? mustn't they be fixing?
Perfect	V-ing perfect
mustn't I have fixed? mustn't you have fixed? mustn't he have fixed? mustn't we have fixed? mustn't you have fixed? mustn't they have fixed?	mustn't I have been fixing? mustn't you have been fixing? mustn't he have been fixing? mustn't we have been fixing? mustn't you have been fixing? mustn't they have been fixing?