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 mustn't yuck you mustn't yuck he mustn't yuck we mustn't yuck you mustn't yuck they mustn't yuck	I mustn't be yucking you mustn't be yucking he mustn't be yucking we mustn't be yucking you mustn't be yucking they mustn't be yucking
Perfect	V-ing perfect
I mustn't have yucked you mustn't have yucked he mustn't have yucked we mustn't have yucked you mustn't have yucked they mustn't have yucked	I mustn't have been yucking you mustn't have been yucking he mustn't have been yucking we mustn't have been yucking you mustn't have been yucking they mustn't 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
mustn't I yuck? mustn't you yuck? mustn't he yuck? mustn't we yuck? mustn't you yuck? mustn't they yuck?	mustn't I be yucking? mustn't you be yucking? mustn't he be yucking? mustn't we be yucking? mustn't you be yucking? mustn't they be yucking?
Perfect	V-ing perfect
mustn't I have yucked? mustn't you have yucked? mustn't he have yucked? mustn't we have yucked? mustn't you have yucked? mustn't they have yucked?	mustn't I have been yucking? mustn't you have been yucking? mustn't he have been yucking? mustn't we have been yucking? mustn't you have been yucking? mustn't they have been yucking?