I must disco you must disco she must disco we must disco you must disco they must disco
V-ing form
I must be discoing you must be discoing she must be discoing we must be discoing you must be discoing they must be discoing
Perfect
I must have discoed you must have discoed she must have discoed we must have discoed you must have discoed they must have discoed
V-ing perfect
I must have been discoing you must have been discoing she must have been discoing we must have been discoing you must have been discoing they must have been discoing
Negation
Simple form
I must not disco you must not disco she must not disco we must not disco you must not disco they must not disco
V-ing form
I must not be discoing you must not be discoing she must not be discoing we must not be discoing you must not be discoing they must not be discoing
Perfect
I must not have discoed you must not have discoed she must not have discoed we must not have discoed you must not have discoed they must not have discoed
V-ing perfect
I must not have been discoing you must not have been discoing she must not have been discoing we must not have been discoing you must not have been discoing they must not have been discoing
Interrogative form
Simple form
must I disco? must you disco? must she disco? must we disco? must you disco? must they disco?
V-ing form
must I be discoing? must you be discoing? must she be discoing? must we be discoing? must you be discoing? must they be discoing?
Perfect
must I have discoed? must you have discoed? must she have discoed? must we have discoed? must you have discoed? must they have discoed?
V-ing perfect
must I have been discoing? must you have been discoing? must she have been discoing? must we have been discoing? must you have been discoing? must they have been discoing?
Interro-negative form
Simple form
must I not disco? must you not disco? must she not disco? must we not disco? must you not disco? must they not disco?
V-ing form
must I not be discoing? must you not be discoing? must she not be discoing? must we not be discoing? must you not be discoing? must they not be discoing?
Perfect
must I not have discoed? must you not have discoed? must she not have discoed? must we not have discoed? must you not have discoed? must they not have discoed?
V-ing perfect
must I not have been discoing? must you not have been discoing? must she not have been discoing? must we not have been discoing? must you not have been discoing? must they not have been discoing?