English verb conjugation
MUST FORK

Regular verb: fork - forked - forked

Affirmation

Simple form	V-ing form
I must fork you must fork he must fork we must fork you must fork they must fork	I must be forking you must be forking he must be forking we must be forking you must be forking they must be forking
Perfect	V-ing perfect
I must have forked you must have forked he must have forked we must have forked you must have forked they must have forked	I must have been forking you must have been forking he must have been forking we must have been forking you must have been forking they must have been forking

Negation

Simple form	V-ing form
I must not fork you must not fork he must not fork we must not fork you must not fork they must not fork	I must not be forking you must not be forking he must not be forking we must not be forking you must not be forking they must not be forking
Perfect	V-ing perfect
I must not have forked you must not have forked he must not have forked we must not have forked you must not have forked they must not have forked	I must not have been forking you must not have been forking he must not have been forking we must not have been forking you must not have been forking they must not have been forking

Interrogative form

Simple form	V-ing form
must I fork? must you fork? must he fork? must we fork? must you fork? must they fork?	must I be forking? must you be forking? must he be forking? must we be forking? must you be forking? must they be forking?
Perfect	V-ing perfect
must I have forked? must you have forked? must he have forked? must we have forked? must you have forked? must they have forked?	must I have been forking? must you have been forking? must he have been forking? must we have been forking? must you have been forking? must they have been forking?

Interro-negative form

Simple form	V-ing form
must I not fork? must you not fork? must he not fork? must we not fork? must you not fork? must they not fork?	must I not be forking? must you not be forking? must he not be forking? must we not be forking? must you not be forking? must they not be forking?
Perfect	V-ing perfect
must I not have forked? must you not have forked? must he not have forked? must we not have forked? must you not have forked? must they not have forked?	must I not have been forking? must you not have been forking? must he not have been forking? must we not have been forking? must you not have been forking? must they not have been forking?