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