I must stock you must stock she must stock we must stock you must stock they must stock
V-ing form
I must be stocking you must be stocking she must be stocking we must be stocking you must be stocking they must be stocking
Perfect
I must have stocked you must have stocked she must have stocked we must have stocked you must have stocked they must have stocked
V-ing perfect
I must have been stocking you must have been stocking she must have been stocking we must have been stocking you must have been stocking they must have been stocking
Negation
Simple form
I mustn't stock you mustn't stock she mustn't stock we mustn't stock you mustn't stock they mustn't stock
V-ing form
I mustn't be stocking you mustn't be stocking she mustn't be stocking we mustn't be stocking you mustn't be stocking they mustn't be stocking
Perfect
I mustn't have stocked you mustn't have stocked she mustn't have stocked we mustn't have stocked you mustn't have stocked they mustn't have stocked
V-ing perfect
I mustn't have been stocking you mustn't have been stocking she mustn't have been stocking we mustn't have been stocking you mustn't have been stocking they mustn't have been stocking
Interrogative form
Simple form
must I stock? must you stock? must she stock? must we stock? must you stock? must they stock?
V-ing form
must I be stocking? must you be stocking? must she be stocking? must we be stocking? must you be stocking? must they be stocking?
Perfect
must I have stocked? must you have stocked? must she have stocked? must we have stocked? must you have stocked? must they have stocked?
V-ing perfect
must I have been stocking? must you have been stocking? must she have been stocking? must we have been stocking? must you have been stocking? must they have been stocking?
Interro-negative form
Simple form
mustn't I stock? mustn't you stock? mustn't she stock? mustn't we stock? mustn't you stock? mustn't they stock?
V-ing form
mustn't I be stocking? mustn't you be stocking? mustn't she be stocking? mustn't we be stocking? mustn't you be stocking? mustn't they be stocking?
Perfect
mustn't I have stocked? mustn't you have stocked? mustn't she have stocked? mustn't we have stocked? mustn't you have stocked? mustn't they have stocked?
V-ing perfect
mustn't I have been stocking? mustn't you have been stocking? mustn't she have been stocking? mustn't we have been stocking? mustn't you have been stocking? mustn't they have been stocking?