must single-space
Regular verb: single-space - single-spaced- single-spaced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must single-space
you must single-space
he must single-space
we must single-space
you must single-space
they must single-space 	I must be single-spacing
you must be single-spacing
he must be single-spacing
we must be single-spacing
you must be single-spacing
they must be single-spacing	I must have single-spaced
you must have single-spaced
he must have single-spaced
we must have single-spaced
you must have single-spaced
they must have single-spaced	I must have been single-spacing
you must have been single-spacing
he must have been single-spacing
we must have been single-spacing
you must have been single-spacing
they must have been single-spacing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not single-space
you must not single-space
he must not single-space
we must not single-space
you must not single-space
they must not single-space 	I must not be single-spacing
you must not be single-spacing
he must not be single-spacing
we must not be single-spacing
you must not be single-spacing
they must not be single-spacing	I must not have single-spaced
you must not have single-spaced
he must not have single-spaced
we must not have single-spaced
you must not have single-spaced
they must not have single-spaced	I must not have been single-spacing
you must not have been single-spacing
he must not have been single-spacing
we must not have been single-spacing
you must not have been single-spacing
they must not have been single-spacing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I single-space?
must you single-space?
must he single-space?
must we single-space?
must you single-space?
must they single-space? 	must I be single-spacing?
must you be single-spacing?
must he be single-spacing?
must we be single-spacing?
must you be single-spacing?
must they be single-spacing? 	must I have single-spaced?
must you have single-spaced?
must he have single-spaced?
must we have single-spaced?
must you have single-spaced?
must they have single-spaced? 	must I have been single-spacing?
must you have been single-spacing?
must he have been single-spacing?
must we have been single-spacing?
must you have been single-spacing?
must they have been single-spacing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not single-space?
must you not single-space?
must he not single-space?
must we not single-space?
must you not single-space?
must they not single-space? 	must I not be single-spacing?
must you not be single-spacing?
must he not be single-spacing?
must we not be single-spacing?
must you not be single-spacing?
must they not be single-spacing? 	must I not have single-spaced?
must you not have single-spaced?
must he not have single-spaced?
must we not have single-spaced?
must you not have single-spaced?
must they not have single-spaced? 	must I not have been single-spacing?
must you not have been single-spacing?
must he not have been single-spacing?
must we not have been single-spacing?
must you not have been single-spacing?
must they not have been single-spacing?