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