I must strap you must strap he must strap we must strap you must strap they must strap
V-ing form
I must be strapping you must be strapping he must be strapping we must be strapping you must be strapping they must be strapping
Perfect
I must have strapped you must have strapped he must have strapped we must have strapped you must have strapped they must have strapped
V-ing perfect
I must have been strapping you must have been strapping he must have been strapping we must have been strapping you must have been strapping they must have been strapping
Negation
Simple form
I must not strap you must not strap he must not strap we must not strap you must not strap they must not strap
V-ing form
I must not be strapping you must not be strapping he must not be strapping we must not be strapping you must not be strapping they must not be strapping
Perfect
I must not have strapped you must not have strapped he must not have strapped we must not have strapped you must not have strapped they must not have strapped
V-ing perfect
I must not have been strapping you must not have been strapping he must not have been strapping we must not have been strapping you must not have been strapping they must not have been strapping
Interrogative form
Simple form
must I strap? must you strap? must he strap? must we strap? must you strap? must they strap?
V-ing form
must I be strapping? must you be strapping? must he be strapping? must we be strapping? must you be strapping? must they be strapping?
Perfect
must I have strapped? must you have strapped? must he have strapped? must we have strapped? must you have strapped? must they have strapped?
V-ing perfect
must I have been strapping? must you have been strapping? must he have been strapping? must we have been strapping? must you have been strapping? must they have been strapping?
Interro-negative form
Simple form
must I not strap? must you not strap? must he not strap? must we not strap? must you not strap? must they not strap?
V-ing form
must I not be strapping? must you not be strapping? must he not be strapping? must we not be strapping? must you not be strapping? must they not be strapping?
Perfect
must I not have strapped? must you not have strapped? must he not have strapped? must we not have strapped? must you not have strapped? must they not have strapped?
V-ing perfect
must I not have been strapping? must you not have been strapping? must he not have been strapping? must we not have been strapping? must you not have been strapping? must they not have been strapping?