I must shade you must shade he must shade we must shade you must shade they must shade
V-ing form
I must be shading you must be shading he must be shading we must be shading you must be shading they must be shading
Perfect
I must have shaded you must have shaded he must have shaded we must have shaded you must have shaded they must have shaded
V-ing perfect
I must have been shading you must have been shading he must have been shading we must have been shading you must have been shading they must have been shading
Negation
Simple form
I mustn't shade you mustn't shade he mustn't shade we mustn't shade you mustn't shade they mustn't shade
V-ing form
I mustn't be shading you mustn't be shading he mustn't be shading we mustn't be shading you mustn't be shading they mustn't be shading
Perfect
I mustn't have shaded you mustn't have shaded he mustn't have shaded we mustn't have shaded you mustn't have shaded they mustn't have shaded
V-ing perfect
I mustn't have been shading you mustn't have been shading he mustn't have been shading we mustn't have been shading you mustn't have been shading they mustn't have been shading
Interrogative form
Simple form
must I shade? must you shade? must he shade? must we shade? must you shade? must they shade?
V-ing form
must I be shading? must you be shading? must he be shading? must we be shading? must you be shading? must they be shading?
Perfect
must I have shaded? must you have shaded? must he have shaded? must we have shaded? must you have shaded? must they have shaded?
V-ing perfect
must I have been shading? must you have been shading? must he have been shading? must we have been shading? must you have been shading? must they have been shading?
Interro-negative form
Simple form
mustn't I shade? mustn't you shade? mustn't he shade? mustn't we shade? mustn't you shade? mustn't they shade?
V-ing form
mustn't I be shading? mustn't you be shading? mustn't he be shading? mustn't we be shading? mustn't you be shading? mustn't they be shading?
Perfect
mustn't I have shaded? mustn't you have shaded? mustn't he have shaded? mustn't we have shaded? mustn't you have shaded? mustn't they have shaded?
V-ing perfect
mustn't I have been shading? mustn't you have been shading? mustn't he have been shading? mustn't we have been shading? mustn't you have been shading? mustn't they have been shading?