must mistake
Irregular verb: mistake - mistook- mistaken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must mistake
you must mistake
he must mistake
we must mistake
you must mistake
they must mistake 	I must be mistaking
you must be mistaking
he must be mistaking
we must be mistaking
you must be mistaking
they must be mistaking	I must have mistaken
you must have mistaken
he must have mistaken
we must have mistaken
you must have mistaken
they must have mistaken	I must have been mistaking
you must have been mistaking
he must have been mistaking
we must have been mistaking
you must have been mistaking
they must have been mistaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not mistake
you must not mistake
he must not mistake
we must not mistake
you must not mistake
they must not mistake 	I must not be mistaking
you must not be mistaking
he must not be mistaking
we must not be mistaking
you must not be mistaking
they must not be mistaking	I must not have mistaken
you must not have mistaken
he must not have mistaken
we must not have mistaken
you must not have mistaken
they must not have mistaken	I must not have been mistaking
you must not have been mistaking
he must not have been mistaking
we must not have been mistaking
you must not have been mistaking
they must not have been mistaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I mistake?
must you mistake?
must he mistake?
must we mistake?
must you mistake?
must they mistake? 	must I be mistaking?
must you be mistaking?
must he be mistaking?
must we be mistaking?
must you be mistaking?
must they be mistaking? 	must I have mistaken?
must you have mistaken?
must he have mistaken?
must we have mistaken?
must you have mistaken?
must they have mistaken? 	must I have been mistaking?
must you have been mistaking?
must he have been mistaking?
must we have been mistaking?
must you have been mistaking?
must they have been mistaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not mistake?
must you not mistake?
must he not mistake?
must we not mistake?
must you not mistake?
must they not mistake? 	must I not be mistaking?
must you not be mistaking?
must he not be mistaking?
must we not be mistaking?
must you not be mistaking?
must they not be mistaking? 	must I not have mistaken?
must you not have mistaken?
must he not have mistaken?
must we not have mistaken?
must you not have mistaken?
must they not have mistaken? 	must I not have been mistaking?
must you not have been mistaking?
must he not have been mistaking?
must we not have been mistaking?
must you not have been mistaking?
must they not have been mistaking?