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