English verb conjugation
MUST SHELVE

Regular verb: shelve - shelved - shelved

Affirmation

Simple form	V-ing form
I must shelve you must shelve he must shelve we must shelve you must shelve they must shelve	I must be shelving you must be shelving he must be shelving we must be shelving you must be shelving they must be shelving
Perfect	V-ing perfect
I must have shelved you must have shelved he must have shelved we must have shelved you must have shelved they must have shelved	I must have been shelving you must have been shelving he must have been shelving we must have been shelving you must have been shelving they must have been shelving

Negation

Simple form	V-ing form
I must not shelve you must not shelve he must not shelve we must not shelve you must not shelve they must not shelve	I must not be shelving you must not be shelving he must not be shelving we must not be shelving you must not be shelving they must not be shelving
Perfect	V-ing perfect
I must not have shelved you must not have shelved he must not have shelved we must not have shelved you must not have shelved they must not have shelved	I must not have been shelving you must not have been shelving he must not have been shelving we must not have been shelving you must not have been shelving they must not have been shelving

Interrogative form

Simple form	V-ing form
must I shelve? must you shelve? must he shelve? must we shelve? must you shelve? must they shelve?	must I be shelving? must you be shelving? must he be shelving? must we be shelving? must you be shelving? must they be shelving?
Perfect	V-ing perfect
must I have shelved? must you have shelved? must he have shelved? must we have shelved? must you have shelved? must they have shelved?	must I have been shelving? must you have been shelving? must he have been shelving? must we have been shelving? must you have been shelving? must they have been shelving?

Interro-negative form

Simple form	V-ing form
must I not shelve? must you not shelve? must he not shelve? must we not shelve? must you not shelve? must they not shelve?	must I not be shelving? must you not be shelving? must he not be shelving? must we not be shelving? must you not be shelving? must they not be shelving?
Perfect	V-ing perfect
must I not have shelved? must you not have shelved? must he not have shelved? must we not have shelved? must you not have shelved? must they not have shelved?	must I not have been shelving? must you not have been shelving? must he not have been shelving? must we not have been shelving? must you not have been shelving? must they not have been shelving?