I must discount you must discount he must discount we must discount you must discount they must discount
V-ing form
I must be discounting you must be discounting he must be discounting we must be discounting you must be discounting they must be discounting
Perfect
I must have discounted you must have discounted he must have discounted we must have discounted you must have discounted they must have discounted
V-ing perfect
I must have been discounting you must have been discounting he must have been discounting we must have been discounting you must have been discounting they must have been discounting
Negation
Simple form
I mustn't discount you mustn't discount he mustn't discount we mustn't discount you mustn't discount they mustn't discount
V-ing form
I mustn't be discounting you mustn't be discounting he mustn't be discounting we mustn't be discounting you mustn't be discounting they mustn't be discounting
Perfect
I mustn't have discounted you mustn't have discounted he mustn't have discounted we mustn't have discounted you mustn't have discounted they mustn't have discounted
V-ing perfect
I mustn't have been discounting you mustn't have been discounting he mustn't have been discounting we mustn't have been discounting you mustn't have been discounting they mustn't have been discounting
Interrogative form
Simple form
must I discount? must you discount? must he discount? must we discount? must you discount? must they discount?
V-ing form
must I be discounting? must you be discounting? must he be discounting? must we be discounting? must you be discounting? must they be discounting?
Perfect
must I have discounted? must you have discounted? must he have discounted? must we have discounted? must you have discounted? must they have discounted?
V-ing perfect
must I have been discounting? must you have been discounting? must he have been discounting? must we have been discounting? must you have been discounting? must they have been discounting?
Interro-negative form
Simple form
mustn't I discount? mustn't you discount? mustn't he discount? mustn't we discount? mustn't you discount? mustn't they discount?
V-ing form
mustn't I be discounting? mustn't you be discounting? mustn't he be discounting? mustn't we be discounting? mustn't you be discounting? mustn't they be discounting?
Perfect
mustn't I have discounted? mustn't you have discounted? mustn't he have discounted? mustn't we have discounted? mustn't you have discounted? mustn't they have discounted?
V-ing perfect
mustn't I have been discounting? mustn't you have been discounting? mustn't he have been discounting? mustn't we have been discounting? mustn't you have been discounting? mustn't they have been discounting?