must couch
Regular verb: couch - couched- couched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must couch
you must couch
she must couch
we must couch
you must couch
they must couch 	I must be couching
you must be couching
she must be couching
we must be couching
you must be couching
they must be couching	I must have couched
you must have couched
she must have couched
we must have couched
you must have couched
they must have couched	I must have been couching
you must have been couching
she must have been couching
we must have been couching
you must have been couching
they must have been couching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not couch
you must not couch
she must not couch
we must not couch
you must not couch
they must not couch 	I must not be couching
you must not be couching
she must not be couching
we must not be couching
you must not be couching
they must not be couching	I must not have couched
you must not have couched
she must not have couched
we must not have couched
you must not have couched
they must not have couched	I must not have been couching
you must not have been couching
she must not have been couching
we must not have been couching
you must not have been couching
they must not have been couching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I couch?
must you couch?
must she couch?
must we couch?
must you couch?
must they couch? 	must I be couching?
must you be couching?
must she be couching?
must we be couching?
must you be couching?
must they be couching? 	must I have couched?
must you have couched?
must she have couched?
must we have couched?
must you have couched?
must they have couched? 	must I have been couching?
must you have been couching?
must she have been couching?
must we have been couching?
must you have been couching?
must they have been couching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not couch?
must you not couch?
must she not couch?
must we not couch?
must you not couch?
must they not couch? 	must I not be couching?
must you not be couching?
must she not be couching?
must we not be couching?
must you not be couching?
must they not be couching? 	must I not have couched?
must you not have couched?
must she not have couched?
must we not have couched?
must you not have couched?
must they not have couched? 	must I not have been couching?
must you not have been couching?
must she not have been couching?
must we not have been couching?
must you not have been couching?
must they not have been couching?