English verb conjugation
MUST FOOL

Regular verb: fool - fooled - fooled

Affirmation

Simple form	V-ing form
I must fool you must fool she must fool we must fool you must fool they must fool	I must be fooling you must be fooling she must be fooling we must be fooling you must be fooling they must be fooling
Perfect	V-ing perfect
I must have fooled you must have fooled she must have fooled we must have fooled you must have fooled they must have fooled	I must have been fooling you must have been fooling she must have been fooling we must have been fooling you must have been fooling they must have been fooling

Negation

Simple form	V-ing form
I mustn't fool you mustn't fool she mustn't fool we mustn't fool you mustn't fool they mustn't fool	I mustn't be fooling you mustn't be fooling she mustn't be fooling we mustn't be fooling you mustn't be fooling they mustn't be fooling
Perfect	V-ing perfect
I mustn't have fooled you mustn't have fooled she mustn't have fooled we mustn't have fooled you mustn't have fooled they mustn't have fooled	I mustn't have been fooling you mustn't have been fooling she mustn't have been fooling we mustn't have been fooling you mustn't have been fooling they mustn't have been fooling

Interrogative form

Simple form	V-ing form
must I fool? must you fool? must she fool? must we fool? must you fool? must they fool?	must I be fooling? must you be fooling? must she be fooling? must we be fooling? must you be fooling? must they be fooling?
Perfect	V-ing perfect
must I have fooled? must you have fooled? must she have fooled? must we have fooled? must you have fooled? must they have fooled?	must I have been fooling? must you have been fooling? must she have been fooling? must we have been fooling? must you have been fooling? must they have been fooling?

Interro-negative form

Simple form	V-ing form
mustn't I fool? mustn't you fool? mustn't she fool? mustn't we fool? mustn't you fool? mustn't they fool?	mustn't I be fooling? mustn't you be fooling? mustn't she be fooling? mustn't we be fooling? mustn't you be fooling? mustn't they be fooling?
Perfect	V-ing perfect
mustn't I have fooled? mustn't you have fooled? mustn't she have fooled? mustn't we have fooled? mustn't you have fooled? mustn't they have fooled?	mustn't I have been fooling? mustn't you have been fooling? mustn't she have been fooling? mustn't we have been fooling? mustn't you have been fooling? mustn't they have been fooling?