English verb conjugation
MUST FIX

Regular verb: fix - fixed - fixed

Affirmation

Simple form	V-ing form
I must fix you must fix she must fix we must fix you must fix they must fix	I must be fixing you must be fixing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she fix? must we fix? must you fix? must they fix?	must I be fixing? must you be fixing? must she 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 she 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 she 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 she 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 she 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 she 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 she have been fixing? mustn't we have been fixing? mustn't you have been fixing? mustn't they have been fixing?