I must fade you must fade he must fade we must fade you must fade they must fade
V-ing form
I must be fading you must be fading he must be fading we must be fading you must be fading they must be fading
Perfect
I must have faded you must have faded he must have faded we must have faded you must have faded they must have faded
V-ing perfect
I must have been fading you must have been fading he must have been fading we must have been fading you must have been fading they must have been fading
Negation
Simple form
I must not fade you must not fade he must not fade we must not fade you must not fade they must not fade
V-ing form
I must not be fading you must not be fading he must not be fading we must not be fading you must not be fading they must not be fading
Perfect
I must not have faded you must not have faded he must not have faded we must not have faded you must not have faded they must not have faded
V-ing perfect
I must not have been fading you must not have been fading he must not have been fading we must not have been fading you must not have been fading they must not have been fading
Interrogative form
Simple form
must I fade? must you fade? must he fade? must we fade? must you fade? must they fade?
V-ing form
must I be fading? must you be fading? must he be fading? must we be fading? must you be fading? must they be fading?
Perfect
must I have faded? must you have faded? must he have faded? must we have faded? must you have faded? must they have faded?
V-ing perfect
must I have been fading? must you have been fading? must he have been fading? must we have been fading? must you have been fading? must they have been fading?
Interro-negative form
Simple form
must I not fade? must you not fade? must he not fade? must we not fade? must you not fade? must they not fade?
V-ing form
must I not be fading? must you not be fading? must he not be fading? must we not be fading? must you not be fading? must they not be fading?
Perfect
must I not have faded? must you not have faded? must he not have faded? must we not have faded? must you not have faded? must they not have faded?
V-ing perfect
must I not have been fading? must you not have been fading? must he not have been fading? must we not have been fading? must you not have been fading? must they not have been fading?