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 mustn't shelve you mustn't shelve he mustn't shelve we mustn't shelve you mustn't shelve they mustn't shelve	I mustn't be shelving you mustn't be shelving he mustn't be shelving we mustn't be shelving you mustn't be shelving they mustn't be shelving
Perfect	V-ing perfect
I mustn't have shelved you mustn't have shelved he mustn't have shelved we mustn't have shelved you mustn't have shelved they mustn't have shelved	I mustn't have been shelving you mustn't have been shelving he mustn't have been shelving we mustn't have been shelving you mustn't have been shelving they mustn't 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
mustn't I shelve? mustn't you shelve? mustn't he shelve? mustn't we shelve? mustn't you shelve? mustn't they shelve?	mustn't I be shelving? mustn't you be shelving? mustn't he be shelving? mustn't we be shelving? mustn't you be shelving? mustn't they be shelving?
Perfect	V-ing perfect
mustn't I have shelved? mustn't you have shelved? mustn't he have shelved? mustn't we have shelved? mustn't you have shelved? mustn't they have shelved?	mustn't I have been shelving? mustn't you have been shelving? mustn't he have been shelving? mustn't we have been shelving? mustn't you have been shelving? mustn't they have been shelving?