English verb conjugation
MUST UNCROSS

Regular verb: uncross - uncrossed - uncrossed

Affirmation

Simple form	V-ing form
I must uncross you must uncross she must uncross we must uncross you must uncross they must uncross	I must be uncrossing you must be uncrossing she must be uncrossing we must be uncrossing you must be uncrossing they must be uncrossing
Perfect	V-ing perfect
I must have uncrossed you must have uncrossed she must have uncrossed we must have uncrossed you must have uncrossed they must have uncrossed	I must have been uncrossing you must have been uncrossing she must have been uncrossing we must have been uncrossing you must have been uncrossing they must have been uncrossing

Negation

Simple form	V-ing form
I mustn't uncross you mustn't uncross she mustn't uncross we mustn't uncross you mustn't uncross they mustn't uncross	I mustn't be uncrossing you mustn't be uncrossing she mustn't be uncrossing we mustn't be uncrossing you mustn't be uncrossing they mustn't be uncrossing
Perfect	V-ing perfect
I mustn't have uncrossed you mustn't have uncrossed she mustn't have uncrossed we mustn't have uncrossed you mustn't have uncrossed they mustn't have uncrossed	I mustn't have been uncrossing you mustn't have been uncrossing she mustn't have been uncrossing we mustn't have been uncrossing you mustn't have been uncrossing they mustn't have been uncrossing

Interrogative form

Simple form	V-ing form
must I uncross? must you uncross? must she uncross? must we uncross? must you uncross? must they uncross?	must I be uncrossing? must you be uncrossing? must she be uncrossing? must we be uncrossing? must you be uncrossing? must they be uncrossing?
Perfect	V-ing perfect
must I have uncrossed? must you have uncrossed? must she have uncrossed? must we have uncrossed? must you have uncrossed? must they have uncrossed?	must I have been uncrossing? must you have been uncrossing? must she have been uncrossing? must we have been uncrossing? must you have been uncrossing? must they have been uncrossing?

Interro-negative form

Simple form	V-ing form
mustn't I uncross? mustn't you uncross? mustn't she uncross? mustn't we uncross? mustn't you uncross? mustn't they uncross?	mustn't I be uncrossing? mustn't you be uncrossing? mustn't she be uncrossing? mustn't we be uncrossing? mustn't you be uncrossing? mustn't they be uncrossing?
Perfect	V-ing perfect
mustn't I have uncrossed? mustn't you have uncrossed? mustn't she have uncrossed? mustn't we have uncrossed? mustn't you have uncrossed? mustn't they have uncrossed?	mustn't I have been uncrossing? mustn't you have been uncrossing? mustn't she have been uncrossing? mustn't we have been uncrossing? mustn't you have been uncrossing? mustn't they have been uncrossing?