English verb conjugation
MUST CROUCH

Regular verb: crouch - crouched - crouched

Affirmation

Simple form	V-ing form
I must crouch you must crouch he must crouch we must crouch you must crouch they must crouch	I must be crouching you must be crouching he must be crouching we must be crouching you must be crouching they must be crouching
Perfect	V-ing perfect
I must have crouched you must have crouched he must have crouched we must have crouched you must have crouched they must have crouched	I must have been crouching you must have been crouching he must have been crouching we must have been crouching you must have been crouching they must have been crouching

Negation

Simple form	V-ing form
I mustn't crouch you mustn't crouch he mustn't crouch we mustn't crouch you mustn't crouch they mustn't crouch	I mustn't be crouching you mustn't be crouching he mustn't be crouching we mustn't be crouching you mustn't be crouching they mustn't be crouching
Perfect	V-ing perfect
I mustn't have crouched you mustn't have crouched he mustn't have crouched we mustn't have crouched you mustn't have crouched they mustn't have crouched	I mustn't have been crouching you mustn't have been crouching he mustn't have been crouching we mustn't have been crouching you mustn't have been crouching they mustn't have been crouching

Interrogative form

Simple form	V-ing form
must I crouch? must you crouch? must he crouch? must we crouch? must you crouch? must they crouch?	must I be crouching? must you be crouching? must he be crouching? must we be crouching? must you be crouching? must they be crouching?
Perfect	V-ing perfect
must I have crouched? must you have crouched? must he have crouched? must we have crouched? must you have crouched? must they have crouched?	must I have been crouching? must you have been crouching? must he have been crouching? must we have been crouching? must you have been crouching? must they have been crouching?

Interro-negative form

Simple form	V-ing form
mustn't I crouch? mustn't you crouch? mustn't he crouch? mustn't we crouch? mustn't you crouch? mustn't they crouch?	mustn't I be crouching? mustn't you be crouching? mustn't he be crouching? mustn't we be crouching? mustn't you be crouching? mustn't they be crouching?
Perfect	V-ing perfect
mustn't I have crouched? mustn't you have crouched? mustn't he have crouched? mustn't we have crouched? mustn't you have crouched? mustn't they have crouched?	mustn't I have been crouching? mustn't you have been crouching? mustn't he have been crouching? mustn't we have been crouching? mustn't you have been crouching? mustn't they have been crouching?