must summer
Regular verb: summer - summered- summered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must summer
you must summer
she must summer
we must summer
you must summer
they must summer 	I must be summering
you must be summering
she must be summering
we must be summering
you must be summering
they must be summering	I must have summered
you must have summered
she must have summered
we must have summered
you must have summered
they must have summered	I must have been summering
you must have been summering
she must have been summering
we must have been summering
you must have been summering
they must have been summering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not summer
you must not summer
she must not summer
we must not summer
you must not summer
they must not summer 	I must not be summering
you must not be summering
she must not be summering
we must not be summering
you must not be summering
they must not be summering	I must not have summered
you must not have summered
she must not have summered
we must not have summered
you must not have summered
they must not have summered	I must not have been summering
you must not have been summering
she must not have been summering
we must not have been summering
you must not have been summering
they must not have been summering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I summer?
must you summer?
must she summer?
must we summer?
must you summer?
must they summer? 	must I be summering?
must you be summering?
must she be summering?
must we be summering?
must you be summering?
must they be summering? 	must I have summered?
must you have summered?
must she have summered?
must we have summered?
must you have summered?
must they have summered? 	must I have been summering?
must you have been summering?
must she have been summering?
must we have been summering?
must you have been summering?
must they have been summering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not summer?
must you not summer?
must she not summer?
must we not summer?
must you not summer?
must they not summer? 	must I not be summering?
must you not be summering?
must she not be summering?
must we not be summering?
must you not be summering?
must they not be summering? 	must I not have summered?
must you not have summered?
must she not have summered?
must we not have summered?
must you not have summered?
must they not have summered? 	must I not have been summering?
must you not have been summering?
must she not have been summering?
must we not have been summering?
must you not have been summering?
must they not have been summering?