English verb conjugation
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Regular verb: best - bested - bested

Affirmation

Simple form	V-ing form
I must best you must best he must best we must best you must best they must best	I must be besting you must be besting he must be besting we must be besting you must be besting they must be besting
Perfect	V-ing perfect
I must have bested you must have bested he must have bested we must have bested you must have bested they must have bested	I must have been besting you must have been besting he must have been besting we must have been besting you must have been besting they must have been besting

Negation

Simple form	V-ing form
I must not best you must not best he must not best we must not best you must not best they must not best	I must not be besting you must not be besting he must not be besting we must not be besting you must not be besting they must not be besting
Perfect	V-ing perfect
I must not have bested you must not have bested he must not have bested we must not have bested you must not have bested they must not have bested	I must not have been besting you must not have been besting he must not have been besting we must not have been besting you must not have been besting they must not have been besting

Interrogative form

Simple form	V-ing form
must I best? must you best? must he best? must we best? must you best? must they best?	must I be besting? must you be besting? must he be besting? must we be besting? must you be besting? must they be besting?
Perfect	V-ing perfect
must I have bested? must you have bested? must he have bested? must we have bested? must you have bested? must they have bested?	must I have been besting? must you have been besting? must he have been besting? must we have been besting? must you have been besting? must they have been besting?

Interro-negative form

Simple form	V-ing form
must I not best? must you not best? must he not best? must we not best? must you not best? must they not best?	must I not be besting? must you not be besting? must he not be besting? must we not be besting? must you not be besting? must they not be besting?
Perfect	V-ing perfect
must I not have bested? must you not have bested? must he not have bested? must we not have bested? must you not have bested? must they not have bested?	must I not have been besting? must you not have been besting? must he not have been besting? must we not have been besting? must you not have been besting? must they not have been besting?