English verb conjugation
MUST CLENCH

Regular verb: clench - clenched - clenched

Affirmation

Simple form	V-ing form
I must clench you must clench she must clench we must clench you must clench they must clench	I must be clenching you must be clenching she 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 she 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 she 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 she 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 she 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 she 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 she 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 she clench? must we clench? must you clench? must they clench?	must I be clenching? must you be clenching? must she 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 she 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 she 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 she 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 she 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 she 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 she have been clenching? mustn't we have been clenching? mustn't you have been clenching? mustn't they have been clenching?