English verb conjugation
MUST IRK

Regular verb: irk - irked - irked

Affirmation

Simple form	V-ing form
I must irk you must irk he must irk we must irk you must irk they must irk	I must be irking you must be irking he must be irking we must be irking you must be irking they must be irking
Perfect	V-ing perfect
I must have irked you must have irked he must have irked we must have irked you must have irked they must have irked	I must have been irking you must have been irking he must have been irking we must have been irking you must have been irking they must have been irking

Negation

Simple form	V-ing form
I must not irk you must not irk he must not irk we must not irk you must not irk they must not irk	I must not be irking you must not be irking he must not be irking we must not be irking you must not be irking they must not be irking
Perfect	V-ing perfect
I must not have irked you must not have irked he must not have irked we must not have irked you must not have irked they must not have irked	I must not have been irking you must not have been irking he must not have been irking we must not have been irking you must not have been irking they must not have been irking

Interrogative form

Simple form	V-ing form
must I irk? must you irk? must he irk? must we irk? must you irk? must they irk?	must I be irking? must you be irking? must he be irking? must we be irking? must you be irking? must they be irking?
Perfect	V-ing perfect
must I have irked? must you have irked? must he have irked? must we have irked? must you have irked? must they have irked?	must I have been irking? must you have been irking? must he have been irking? must we have been irking? must you have been irking? must they have been irking?

Interro-negative form

Simple form	V-ing form
must I not irk? must you not irk? must he not irk? must we not irk? must you not irk? must they not irk?	must I not be irking? must you not be irking? must he not be irking? must we not be irking? must you not be irking? must they not be irking?
Perfect	V-ing perfect
must I not have irked? must you not have irked? must he not have irked? must we not have irked? must you not have irked? must they not have irked?	must I not have been irking? must you not have been irking? must he not have been irking? must we not have been irking? must you not have been irking? must they not have been irking?