English verb conjugation
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Regular verb: apprentice - apprenticed - apprenticed

Affirmation

Simple form	V-ing form
I must apprentice you must apprentice he must apprentice we must apprentice you must apprentice they must apprentice	I must be apprenticing you must be apprenticing he must be apprenticing we must be apprenticing you must be apprenticing they must be apprenticing
Perfect	V-ing perfect
I must have apprenticed you must have apprenticed he must have apprenticed we must have apprenticed you must have apprenticed they must have apprenticed	I must have been apprenticing you must have been apprenticing he must have been apprenticing we must have been apprenticing you must have been apprenticing they must have been apprenticing

Negation

Simple form	V-ing form
I must not apprentice you must not apprentice he must not apprentice we must not apprentice you must not apprentice they must not apprentice	I must not be apprenticing you must not be apprenticing he must not be apprenticing we must not be apprenticing you must not be apprenticing they must not be apprenticing
Perfect	V-ing perfect
I must not have apprenticed you must not have apprenticed he must not have apprenticed we must not have apprenticed you must not have apprenticed they must not have apprenticed	I must not have been apprenticing you must not have been apprenticing he must not have been apprenticing we must not have been apprenticing you must not have been apprenticing they must not have been apprenticing

Interrogative form

Simple form	V-ing form
must I apprentice? must you apprentice? must he apprentice? must we apprentice? must you apprentice? must they apprentice?	must I be apprenticing? must you be apprenticing? must he be apprenticing? must we be apprenticing? must you be apprenticing? must they be apprenticing?
Perfect	V-ing perfect
must I have apprenticed? must you have apprenticed? must he have apprenticed? must we have apprenticed? must you have apprenticed? must they have apprenticed?	must I have been apprenticing? must you have been apprenticing? must he have been apprenticing? must we have been apprenticing? must you have been apprenticing? must they have been apprenticing?

Interro-negative form

Simple form	V-ing form
must I not apprentice? must you not apprentice? must he not apprentice? must we not apprentice? must you not apprentice? must they not apprentice?	must I not be apprenticing? must you not be apprenticing? must he not be apprenticing? must we not be apprenticing? must you not be apprenticing? must they not be apprenticing?
Perfect	V-ing perfect
must I not have apprenticed? must you not have apprenticed? must he not have apprenticed? must we not have apprenticed? must you not have apprenticed? must they not have apprenticed?	must I not have been apprenticing? must you not have been apprenticing? must he not have been apprenticing? must we not have been apprenticing? must you not have been apprenticing? must they not have been apprenticing?