English verb conjugation
MUST RECUR

Regular verb: recur - recurred - recurred

Affirmation

Simple form	V-ing form
I must recur you must recur she must recur we must recur you must recur they must recur	I must be recurring you must be recurring she must be recurring we must be recurring you must be recurring they must be recurring
Perfect	V-ing perfect
I must have recurred you must have recurred she must have recurred we must have recurred you must have recurred they must have recurred	I must have been recurring you must have been recurring she must have been recurring we must have been recurring you must have been recurring they must have been recurring

Negation

Simple form	V-ing form
I must not recur you must not recur she must not recur we must not recur you must not recur they must not recur	I must not be recurring you must not be recurring she must not be recurring we must not be recurring you must not be recurring they must not be recurring
Perfect	V-ing perfect
I must not have recurred you must not have recurred she must not have recurred we must not have recurred you must not have recurred they must not have recurred	I must not have been recurring you must not have been recurring she must not have been recurring we must not have been recurring you must not have been recurring they must not have been recurring

Interrogative form

Simple form	V-ing form
must I recur? must you recur? must she recur? must we recur? must you recur? must they recur?	must I be recurring? must you be recurring? must she be recurring? must we be recurring? must you be recurring? must they be recurring?
Perfect	V-ing perfect
must I have recurred? must you have recurred? must she have recurred? must we have recurred? must you have recurred? must they have recurred?	must I have been recurring? must you have been recurring? must she have been recurring? must we have been recurring? must you have been recurring? must they have been recurring?

Interro-negative form

Simple form	V-ing form
must I not recur? must you not recur? must she not recur? must we not recur? must you not recur? must they not recur?	must I not be recurring? must you not be recurring? must she not be recurring? must we not be recurring? must you not be recurring? must they not be recurring?
Perfect	V-ing perfect
must I not have recurred? must you not have recurred? must she not have recurred? must we not have recurred? must you not have recurred? must they not have recurred?	must I not have been recurring? must you not have been recurring? must she not have been recurring? must we not have been recurring? must you not have been recurring? must they not have been recurring?