I must decalcify you must decalcify she must decalcify we must decalcify you must decalcify they must decalcify
V-ing form
I must be decalcifying you must be decalcifying she must be decalcifying we must be decalcifying you must be decalcifying they must be decalcifying
Perfect
I must have decalcified you must have decalcified she must have decalcified we must have decalcified you must have decalcified they must have decalcified
V-ing perfect
I must have been decalcifying you must have been decalcifying she must have been decalcifying we must have been decalcifying you must have been decalcifying they must have been decalcifying
Negation
Simple form
I must not decalcify you must not decalcify she must not decalcify we must not decalcify you must not decalcify they must not decalcify
V-ing form
I must not be decalcifying you must not be decalcifying she must not be decalcifying we must not be decalcifying you must not be decalcifying they must not be decalcifying
Perfect
I must not have decalcified you must not have decalcified she must not have decalcified we must not have decalcified you must not have decalcified they must not have decalcified
V-ing perfect
I must not have been decalcifying you must not have been decalcifying she must not have been decalcifying we must not have been decalcifying you must not have been decalcifying they must not have been decalcifying
Interrogative form
Simple form
must I decalcify? must you decalcify? must she decalcify? must we decalcify? must you decalcify? must they decalcify?
V-ing form
must I be decalcifying? must you be decalcifying? must she be decalcifying? must we be decalcifying? must you be decalcifying? must they be decalcifying?
Perfect
must I have decalcified? must you have decalcified? must she have decalcified? must we have decalcified? must you have decalcified? must they have decalcified?
V-ing perfect
must I have been decalcifying? must you have been decalcifying? must she have been decalcifying? must we have been decalcifying? must you have been decalcifying? must they have been decalcifying?
Interro-negative form
Simple form
must I not decalcify? must you not decalcify? must she not decalcify? must we not decalcify? must you not decalcify? must they not decalcify?
V-ing form
must I not be decalcifying? must you not be decalcifying? must she not be decalcifying? must we not be decalcifying? must you not be decalcifying? must they not be decalcifying?
Perfect
must I not have decalcified? must you not have decalcified? must she not have decalcified? must we not have decalcified? must you not have decalcified? must they not have decalcified?
V-ing perfect
must I not have been decalcifying? must you not have been decalcifying? must she not have been decalcifying? must we not have been decalcifying? must you not have been decalcifying? must they not have been decalcifying?