must crater
Regular verb: crater - cratered- cratered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must crater
you must crater
she must crater
we must crater
you must crater
they must crater 	I must be cratering
you must be cratering
she must be cratering
we must be cratering
you must be cratering
they must be cratering	I must have cratered
you must have cratered
she must have cratered
we must have cratered
you must have cratered
they must have cratered	I must have been cratering
you must have been cratering
she must have been cratering
we must have been cratering
you must have been cratering
they must have been cratering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't crater
you mustn't crater
she mustn't crater
we mustn't crater
you mustn't crater
they mustn't crater 	I mustn't be cratering
you mustn't be cratering
she mustn't be cratering
we mustn't be cratering
you mustn't be cratering
they mustn't be cratering	I mustn't have cratered
you mustn't have cratered
she mustn't have cratered
we mustn't have cratered
you mustn't have cratered
they mustn't have cratered	I mustn't have been cratering
you mustn't have been cratering
she mustn't have been cratering
we mustn't have been cratering
you mustn't have been cratering
they mustn't have been cratering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I crater?
must you crater?
must she crater?
must we crater?
must you crater?
must they crater? 	must I be cratering?
must you be cratering?
must she be cratering?
must we be cratering?
must you be cratering?
must they be cratering? 	must I have cratered?
must you have cratered?
must she have cratered?
must we have cratered?
must you have cratered?
must they have cratered? 	must I have been cratering?
must you have been cratering?
must she have been cratering?
must we have been cratering?
must you have been cratering?
must they have been cratering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I crater?
mustn't you crater?
mustn't she crater?
mustn't we crater?
mustn't you crater?
mustn't they crater? 	mustn't I be cratering?
mustn't you be cratering?
mustn't she be cratering?
mustn't we be cratering?
mustn't you be cratering?
mustn't they be cratering? 	mustn't I have cratered?
mustn't you have cratered?
mustn't she have cratered?
mustn't we have cratered?
mustn't you have cratered?
mustn't they have cratered? 	mustn't I have been cratering?
mustn't you have been cratering?
mustn't she have been cratering?
mustn't we have been cratering?
mustn't you have been cratering?
mustn't they have been cratering?