English verb conjugation
MUST COUCH

Regular verb: couch - couched - couched

Affirmation

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