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 mustn't clench you mustn't clench he mustn't clench we mustn't clench you mustn't clench they mustn't clench	I mustn't be clenching you mustn't be clenching he mustn't be clenching we mustn't be clenching you mustn't be clenching they mustn't be clenching
Perfect	V-ing perfect
I mustn't have clenched you mustn't have clenched he mustn't have clenched we mustn't have clenched you mustn't have clenched they mustn't have clenched	I mustn't have been clenching you mustn't have been clenching he mustn't have been clenching we mustn't have been clenching you mustn't have been clenching they mustn't 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
mustn't I clench? mustn't you clench? mustn't he clench? mustn't we clench? mustn't you clench? mustn't they clench?	mustn't I be clenching? mustn't you be clenching? mustn't he be clenching? mustn't we be clenching? mustn't you be clenching? mustn't they be clenching?
Perfect	V-ing perfect
mustn't I have clenched? mustn't you have clenched? mustn't he have clenched? mustn't we have clenched? mustn't you have clenched? mustn't they have clenched?	mustn't I have been clenching? mustn't you have been clenching? mustn't he have been clenching? mustn't we have been clenching? mustn't you have been clenching? mustn't they have been clenching?