English verb conjugation
MUST UNCROSS

Regular verb: uncross - uncrossed - uncrossed

Affirmation

Simple form	V-ing form
I must uncross you must uncross he must uncross we must uncross you must uncross they must uncross	I must be uncrossing you must be uncrossing he 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 he 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 he 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 must not uncross you must not uncross he must not uncross we must not uncross you must not uncross they must not uncross	I must not be uncrossing you must not be uncrossing he must not be uncrossing we must not be uncrossing you must not be uncrossing they must not be uncrossing
Perfect	V-ing perfect
I must not have uncrossed you must not have uncrossed he must not have uncrossed we must not have uncrossed you must not have uncrossed they must not have uncrossed	I must not have been uncrossing you must not have been uncrossing he must not have been uncrossing we must not have been uncrossing you must not have been uncrossing they must not have been uncrossing

Interrogative form

Simple form	V-ing form
must I uncross? must you uncross? must he uncross? must we uncross? must you uncross? must they uncross?	must I be uncrossing? must you be uncrossing? must he 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 he 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 he 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
must I not uncross? must you not uncross? must he not uncross? must we not uncross? must you not uncross? must they not uncross?	must I not be uncrossing? must you not be uncrossing? must he not be uncrossing? must we not be uncrossing? must you not be uncrossing? must they not be uncrossing?
Perfect	V-ing perfect
must I not have uncrossed? must you not have uncrossed? must he not have uncrossed? must we not have uncrossed? must you not have uncrossed? must they not have uncrossed?	must I not have been uncrossing? must you not have been uncrossing? must he not have been uncrossing? must we not have been uncrossing? must you not have been uncrossing? must they not have been uncrossing?