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