English verb conjugation
MUST CLENCH

Regular verb: clench - clenched - clenched

Affirmation

Simple form	V-ing form
I must clench you must clench he must clench we must clench you must clench they must clench	I must be clenching you must be clenching he must be clenching we must be clenching you must be clenching they must be clenching
Perfect	V-ing perfect
I must have clenched you must have clenched he must have clenched we must have clenched you must have clenched they must have clenched	I must have been clenching you must have been clenching he must have been clenching we must have been clenching you must have been clenching they must have been clenching

Negation

Simple form	V-ing form
I must not clench you must not clench he must not clench we must not clench you must not clench they must not clench	I must not be clenching you must not be clenching he must not be clenching we must not be clenching you must not be clenching they must not be clenching
Perfect	V-ing perfect
I must not have clenched you must not have clenched he must not have clenched we must not have clenched you must not have clenched they must not have clenched	I must not have been clenching you must not have been clenching he must not have been clenching we must not have been clenching you must not have been clenching they must not have been clenching

Interrogative form

Simple form	V-ing form
must I clench? must you clench? must he clench? must we clench? must you clench? must they clench?	must I be clenching? must you be clenching? must he be clenching? must we be clenching? must you be clenching? must they be clenching?
Perfect	V-ing perfect
must I have clenched? must you have clenched? must he have clenched? must we have clenched? must you have clenched? must they have clenched?	must I have been clenching? must you have been clenching? must he have been clenching? must we have been clenching? must you have been clenching? must they have been clenching?

Interro-negative form

Simple form	V-ing form
must I not clench? must you not clench? must he not clench? must we not clench? must you not clench? must they not clench?	must I not be clenching? must you not be clenching? must he not be clenching? must we not be clenching? must you not be clenching? must they not be clenching?
Perfect	V-ing perfect
must I not have clenched? must you not have clenched? must he not have clenched? must we not have clenched? must you not have clenched? must they not have clenched?	must I not have been clenching? must you not have been clenching? must he not have been clenching? must we not have been clenching? must you not have been clenching? must they not have been clenching?