English verb conjugation
MUST YUCK

Regular verb: yuck - yucked - yucked

Affirmation

Simple form	V-ing form
I must yuck you must yuck he must yuck we must yuck you must yuck they must yuck	I must be yucking you must be yucking he must be yucking we must be yucking you must be yucking they must be yucking
Perfect	V-ing perfect
I must have yucked you must have yucked he must have yucked we must have yucked you must have yucked they must have yucked	I must have been yucking you must have been yucking he must have been yucking we must have been yucking you must have been yucking they must have been yucking

Negation

Simple form	V-ing form
I must not yuck you must not yuck he must not yuck we must not yuck you must not yuck they must not yuck	I must not be yucking you must not be yucking he must not be yucking we must not be yucking you must not be yucking they must not be yucking
Perfect	V-ing perfect
I must not have yucked you must not have yucked he must not have yucked we must not have yucked you must not have yucked they must not have yucked	I must not have been yucking you must not have been yucking he must not have been yucking we must not have been yucking you must not have been yucking they must not have been yucking

Interrogative form

Simple form	V-ing form
must I yuck? must you yuck? must he yuck? must we yuck? must you yuck? must they yuck?	must I be yucking? must you be yucking? must he be yucking? must we be yucking? must you be yucking? must they be yucking?
Perfect	V-ing perfect
must I have yucked? must you have yucked? must he have yucked? must we have yucked? must you have yucked? must they have yucked?	must I have been yucking? must you have been yucking? must he have been yucking? must we have been yucking? must you have been yucking? must they have been yucking?

Interro-negative form

Simple form	V-ing form
must I not yuck? must you not yuck? must he not yuck? must we not yuck? must you not yuck? must they not yuck?	must I not be yucking? must you not be yucking? must he not be yucking? must we not be yucking? must you not be yucking? must they not be yucking?
Perfect	V-ing perfect
must I not have yucked? must you not have yucked? must he not have yucked? must we not have yucked? must you not have yucked? must they not have yucked?	must I not have been yucking? must you not have been yucking? must he not have been yucking? must we not have been yucking? must you not have been yucking? must they not have been yucking?