I must spall you must spall he must spall we must spall you must spall they must spall
V-ing form
I must be spalling you must be spalling he must be spalling we must be spalling you must be spalling they must be spalling
Perfect
I must have spalled you must have spalled he must have spalled we must have spalled you must have spalled they must have spalled
V-ing perfect
I must have been spalling you must have been spalling he must have been spalling we must have been spalling you must have been spalling they must have been spalling
Negation
Simple form
I must not spall you must not spall he must not spall we must not spall you must not spall they must not spall
V-ing form
I must not be spalling you must not be spalling he must not be spalling we must not be spalling you must not be spalling they must not be spalling
Perfect
I must not have spalled you must not have spalled he must not have spalled we must not have spalled you must not have spalled they must not have spalled
V-ing perfect
I must not have been spalling you must not have been spalling he must not have been spalling we must not have been spalling you must not have been spalling they must not have been spalling
Interrogative form
Simple form
must I spall? must you spall? must he spall? must we spall? must you spall? must they spall?
V-ing form
must I be spalling? must you be spalling? must he be spalling? must we be spalling? must you be spalling? must they be spalling?
Perfect
must I have spalled? must you have spalled? must he have spalled? must we have spalled? must you have spalled? must they have spalled?
V-ing perfect
must I have been spalling? must you have been spalling? must he have been spalling? must we have been spalling? must you have been spalling? must they have been spalling?
Interro-negative form
Simple form
must I not spall? must you not spall? must he not spall? must we not spall? must you not spall? must they not spall?
V-ing form
must I not be spalling? must you not be spalling? must he not be spalling? must we not be spalling? must you not be spalling? must they not be spalling?
Perfect
must I not have spalled? must you not have spalled? must he not have spalled? must we not have spalled? must you not have spalled? must they not have spalled?
V-ing perfect
must I not have been spalling? must you not have been spalling? must he not have been spalling? must we not have been spalling? must you not have been spalling? must they not have been spalling?