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