must uncross
Regular verb: uncross - uncrossed- uncrossed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?