English verb conjugation
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Regular verb: defer - deferred - deferred

Affirmation

Simple form	V-ing form
I must defer you must defer she must defer we must defer you must defer they must defer	I must be deferring you must be deferring she must be deferring we must be deferring you must be deferring they must be deferring
Perfect	V-ing perfect
I must have deferred you must have deferred she must have deferred we must have deferred you must have deferred they must have deferred	I must have been deferring you must have been deferring she must have been deferring we must have been deferring you must have been deferring they must have been deferring

Negation

Simple form	V-ing form
I must not defer you must not defer she must not defer we must not defer you must not defer they must not defer	I must not be deferring you must not be deferring she must not be deferring we must not be deferring you must not be deferring they must not be deferring
Perfect	V-ing perfect
I must not have deferred you must not have deferred she must not have deferred we must not have deferred you must not have deferred they must not have deferred	I must not have been deferring you must not have been deferring she must not have been deferring we must not have been deferring you must not have been deferring they must not have been deferring

Interrogative form

Simple form	V-ing form
must I defer? must you defer? must she defer? must we defer? must you defer? must they defer?	must I be deferring? must you be deferring? must she be deferring? must we be deferring? must you be deferring? must they be deferring?
Perfect	V-ing perfect
must I have deferred? must you have deferred? must she have deferred? must we have deferred? must you have deferred? must they have deferred?	must I have been deferring? must you have been deferring? must she have been deferring? must we have been deferring? must you have been deferring? must they have been deferring?

Interro-negative form

Simple form	V-ing form
must I not defer? must you not defer? must she not defer? must we not defer? must you not defer? must they not defer?	must I not be deferring? must you not be deferring? must she not be deferring? must we not be deferring? must you not be deferring? must they not be deferring?
Perfect	V-ing perfect
must I not have deferred? must you not have deferred? must she not have deferred? must we not have deferred? must you not have deferred? must they not have deferred?	must I not have been deferring? must you not have been deferring? must she not have been deferring? must we not have been deferring? must you not have been deferring? must they not have been deferring?