must irk
Regular verb: irk - irked- irked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?