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 must not crater
you must not crater
she must not crater
we must not crater
you must not crater
they must not crater 	I must not be cratering
you must not be cratering
she must not be cratering
we must not be cratering
you must not be cratering
they must not be cratering	I must not have cratered
you must not have cratered
she must not have cratered
we must not have cratered
you must not have cratered
they must not have cratered	I must not have been cratering
you must not have been cratering
she must not have been cratering
we must not have been cratering
you must not have been cratering
they must not 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 	
must I not crater?
must you not crater?
must she not crater?
must we not crater?
must you not crater?
must they not crater? 	must I not be cratering?
must you not be cratering?
must she not be cratering?
must we not be cratering?
must you not be cratering?
must they not be cratering? 	must I not have cratered?
must you not have cratered?
must she not have cratered?
must we not have cratered?
must you not have cratered?
must they not have cratered? 	must I not have been cratering?
must you not have been cratering?
must she not have been cratering?
must we not have been cratering?
must you not have been cratering?
must they not have been cratering?