I must clarify you must clarify she must clarify we must clarify you must clarify they must clarify
V-ing form
I must be clarifying you must be clarifying she must be clarifying we must be clarifying you must be clarifying they must be clarifying
Perfect
I must have clarified you must have clarified she must have clarified we must have clarified you must have clarified they must have clarified
V-ing perfect
I must have been clarifying you must have been clarifying she must have been clarifying we must have been clarifying you must have been clarifying they must have been clarifying
Negation
Simple form
I must not clarify you must not clarify she must not clarify we must not clarify you must not clarify they must not clarify
V-ing form
I must not be clarifying you must not be clarifying she must not be clarifying we must not be clarifying you must not be clarifying they must not be clarifying
Perfect
I must not have clarified you must not have clarified she must not have clarified we must not have clarified you must not have clarified they must not have clarified
V-ing perfect
I must not have been clarifying you must not have been clarifying she must not have been clarifying we must not have been clarifying you must not have been clarifying they must not have been clarifying
Interrogative form
Simple form
must I clarify? must you clarify? must she clarify? must we clarify? must you clarify? must they clarify?
V-ing form
must I be clarifying? must you be clarifying? must she be clarifying? must we be clarifying? must you be clarifying? must they be clarifying?
Perfect
must I have clarified? must you have clarified? must she have clarified? must we have clarified? must you have clarified? must they have clarified?
V-ing perfect
must I have been clarifying? must you have been clarifying? must she have been clarifying? must we have been clarifying? must you have been clarifying? must they have been clarifying?
Interro-negative form
Simple form
must I not clarify? must you not clarify? must she not clarify? must we not clarify? must you not clarify? must they not clarify?
V-ing form
must I not be clarifying? must you not be clarifying? must she not be clarifying? must we not be clarifying? must you not be clarifying? must they not be clarifying?
Perfect
must I not have clarified? must you not have clarified? must she not have clarified? must we not have clarified? must you not have clarified? must they not have clarified?
V-ing perfect
must I not have been clarifying? must you not have been clarifying? must she not have been clarifying? must we not have been clarifying? must you not have been clarifying? must they not have been clarifying?