must spank
Regular verb: spank - spanked- spanked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spank
you must spank
he must spank
we must spank
you must spank
they must spank 	I must be spanking
you must be spanking
he must be spanking
we must be spanking
you must be spanking
they must be spanking	I must have spanked
you must have spanked
he must have spanked
we must have spanked
you must have spanked
they must have spanked	I must have been spanking
you must have been spanking
he must have been spanking
we must have been spanking
you must have been spanking
they must have been spanking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not spank
you must not spank
he must not spank
we must not spank
you must not spank
they must not spank 	I must not be spanking
you must not be spanking
he must not be spanking
we must not be spanking
you must not be spanking
they must not be spanking	I must not have spanked
you must not have spanked
he must not have spanked
we must not have spanked
you must not have spanked
they must not have spanked	I must not have been spanking
you must not have been spanking
he must not have been spanking
we must not have been spanking
you must not have been spanking
they must not have been spanking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I spank?
must you spank?
must he spank?
must we spank?
must you spank?
must they spank? 	must I be spanking?
must you be spanking?
must he be spanking?
must we be spanking?
must you be spanking?
must they be spanking? 	must I have spanked?
must you have spanked?
must he have spanked?
must we have spanked?
must you have spanked?
must they have spanked? 	must I have been spanking?
must you have been spanking?
must he have been spanking?
must we have been spanking?
must you have been spanking?
must they have been spanking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not spank?
must you not spank?
must he not spank?
must we not spank?
must you not spank?
must they not spank? 	must I not be spanking?
must you not be spanking?
must he not be spanking?
must we not be spanking?
must you not be spanking?
must they not be spanking? 	must I not have spanked?
must you not have spanked?
must he not have spanked?
must we not have spanked?
must you not have spanked?
must they not have spanked? 	must I not have been spanking?
must you not have been spanking?
must he not have been spanking?
must we not have been spanking?
must you not have been spanking?
must they not have been spanking?