must eat
Irregular verb: eat - ate- eaten

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must eat
you must eat
she must eat
we must eat
you must eat
they must eat 	I must be eating
you must be eating
she must be eating
we must be eating
you must be eating
they must be eating	I must have eaten
you must have eaten
she must have eaten
we must have eaten
you must have eaten
they must have eaten	I must have been eating
you must have been eating
she must have been eating
we must have been eating
you must have been eating
they must have been eating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't eat
you mustn't eat
she mustn't eat
we mustn't eat
you mustn't eat
they mustn't eat 	I mustn't be eating
you mustn't be eating
she mustn't be eating
we mustn't be eating
you mustn't be eating
they mustn't be eating	I mustn't have eaten
you mustn't have eaten
she mustn't have eaten
we mustn't have eaten
you mustn't have eaten
they mustn't have eaten	I mustn't have been eating
you mustn't have been eating
she mustn't have been eating
we mustn't have been eating
you mustn't have been eating
they mustn't have been eating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I eat?
must you eat?
must she eat?
must we eat?
must you eat?
must they eat? 	must I be eating?
must you be eating?
must she be eating?
must we be eating?
must you be eating?
must they be eating? 	must I have eaten?
must you have eaten?
must she have eaten?
must we have eaten?
must you have eaten?
must they have eaten? 	must I have been eating?
must you have been eating?
must she have been eating?
must we have been eating?
must you have been eating?
must they have been eating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I eat?
mustn't you eat?
mustn't she eat?
mustn't we eat?
mustn't you eat?
mustn't they eat? 	mustn't I be eating?
mustn't you be eating?
mustn't she be eating?
mustn't we be eating?
mustn't you be eating?
mustn't they be eating? 	mustn't I have eaten?
mustn't you have eaten?
mustn't she have eaten?
mustn't we have eaten?
mustn't you have eaten?
mustn't they have eaten? 	mustn't I have been eating?
mustn't you have been eating?
mustn't she have been eating?
mustn't we have been eating?
mustn't you have been eating?
mustn't they have been eating?