I must shear you must shear he must shear we must shear you must shear they must shear
V-ing form
I must be shearing you must be shearing he must be shearing we must be shearing you must be shearing they must be shearing
Perfect
I must have sheared, shorn you must have sheared, shorn he must have sheared, shorn we must have sheared, shorn you must have sheared, shorn they must have sheared, shorn
V-ing perfect
I must have been shearing you must have been shearing he must have been shearing we must have been shearing you must have been shearing they must have been shearing
Negation
Simple form
I mustn't shear you mustn't shear he mustn't shear we mustn't shear you mustn't shear they mustn't shear
V-ing form
I mustn't be shearing you mustn't be shearing he mustn't be shearing we mustn't be shearing you mustn't be shearing they mustn't be shearing
Perfect
I mustn't have sheared, shorn you mustn't have sheared, shorn he mustn't have sheared, shorn we mustn't have sheared, shorn you mustn't have sheared, shorn they mustn't have sheared, shorn
V-ing perfect
I mustn't have been shearing you mustn't have been shearing he mustn't have been shearing we mustn't have been shearing you mustn't have been shearing they mustn't have been shearing
Interrogative form
Simple form
must I shear? must you shear? must he shear? must we shear? must you shear? must they shear?
V-ing form
must I be shearing? must you be shearing? must he be shearing? must we be shearing? must you be shearing? must they be shearing?
Perfect
must I have sheared, shorn? must you have sheared, shorn? must he have sheared, shorn? must we have sheared, shorn? must you have sheared, shorn? must they have sheared, shorn?
V-ing perfect
must I have been shearing? must you have been shearing? must he have been shearing? must we have been shearing? must you have been shearing? must they have been shearing?
Interro-negative form
Simple form
mustn't I shear? mustn't you shear? mustn't he shear? mustn't we shear? mustn't you shear? mustn't they shear?
V-ing form
mustn't I be shearing? mustn't you be shearing? mustn't he be shearing? mustn't we be shearing? mustn't you be shearing? mustn't they be shearing?
Perfect
mustn't I have sheared, shorn? mustn't you have sheared, shorn? mustn't he have sheared, shorn? mustn't we have sheared, shorn? mustn't you have sheared, shorn? mustn't they have sheared, shorn?
V-ing perfect
mustn't I have been shearing? mustn't you have been shearing? mustn't he have been shearing? mustn't we have been shearing? mustn't you have been shearing? mustn't they have been shearing?