must spall
Regular verb: spall - spalled- spalled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spall
you must spall
he must spall
we must spall
you must spall
they must spall 	I must be spalling
you must be spalling
he must be spalling
we must be spalling
you must be spalling
they must be spalling	I must have spalled
you must have spalled
he must have spalled
we must have spalled
you must have spalled
they must have spalled	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 	V-ing form 	Perfect 	V-ing perfect 	
I must not spall
you must not spall
he must not spall
we must not spall
you must not spall
they must not spall 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
must I spall?
must you spall?
must he spall?
must we spall?
must you spall?
must they spall? 	must I be spalling?
must you be spalling?
must he be spalling?
must we be spalling?
must you be spalling?
must they be spalling? 	must I have spalled?
must you have spalled?
must he have spalled?
must we have spalled?
must you have spalled?
must they have spalled? 	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 	V-ing form 	Perfect 	V-ing perfect 	
must I not spall?
must you not spall?
must he not spall?
must we not spall?
must you not spall?
must they not spall? 	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? 	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? 	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?