English verb conjugation
MUST ABSTAIN

Regular verb: abstain - abstained - abstained

Affirmation

Simple form	V-ing form
I must abstain you must abstain she must abstain we must abstain you must abstain they must abstain	I must be abstaining you must be abstaining she must be abstaining we must be abstaining you must be abstaining they must be abstaining
Perfect	V-ing perfect
I must have abstained you must have abstained she must have abstained we must have abstained you must have abstained they must have abstained	I must have been abstaining you must have been abstaining she must have been abstaining we must have been abstaining you must have been abstaining they must have been abstaining

Negation

Simple form	V-ing form
I must not abstain you must not abstain she must not abstain we must not abstain you must not abstain they must not abstain	I must not be abstaining you must not be abstaining she must not be abstaining we must not be abstaining you must not be abstaining they must not be abstaining
Perfect	V-ing perfect
I must not have abstained you must not have abstained she must not have abstained we must not have abstained you must not have abstained they must not have abstained	I must not have been abstaining you must not have been abstaining she must not have been abstaining we must not have been abstaining you must not have been abstaining they must not have been abstaining

Interrogative form

Simple form	V-ing form
must I abstain? must you abstain? must she abstain? must we abstain? must you abstain? must they abstain?	must I be abstaining? must you be abstaining? must she be abstaining? must we be abstaining? must you be abstaining? must they be abstaining?
Perfect	V-ing perfect
must I have abstained? must you have abstained? must she have abstained? must we have abstained? must you have abstained? must they have abstained?	must I have been abstaining? must you have been abstaining? must she have been abstaining? must we have been abstaining? must you have been abstaining? must they have been abstaining?

Interro-negative form

Simple form	V-ing form
must I not abstain? must you not abstain? must she not abstain? must we not abstain? must you not abstain? must they not abstain?	must I not be abstaining? must you not be abstaining? must she not be abstaining? must we not be abstaining? must you not be abstaining? must they not be abstaining?
Perfect	V-ing perfect
must I not have abstained? must you not have abstained? must she not have abstained? must we not have abstained? must you not have abstained? must they not have abstained?	must I not have been abstaining? must you not have been abstaining? must she not have been abstaining? must we not have been abstaining? must you not have been abstaining? must they not have been abstaining?