English verb conjugation
MUST PERCH

Regular verb: perch - perched - perched

Affirmation

Simple form	V-ing form
I must perch you must perch he must perch we must perch you must perch they must perch	I must be perching you must be perching he must be perching we must be perching you must be perching they must be perching
Perfect	V-ing perfect
I must have perched you must have perched he must have perched we must have perched you must have perched they must have perched	I must have been perching you must have been perching he must have been perching we must have been perching you must have been perching they must have been perching

Negation

Simple form	V-ing form
I mustn't perch you mustn't perch he mustn't perch we mustn't perch you mustn't perch they mustn't perch	I mustn't be perching you mustn't be perching he mustn't be perching we mustn't be perching you mustn't be perching they mustn't be perching
Perfect	V-ing perfect
I mustn't have perched you mustn't have perched he mustn't have perched we mustn't have perched you mustn't have perched they mustn't have perched	I mustn't have been perching you mustn't have been perching he mustn't have been perching we mustn't have been perching you mustn't have been perching they mustn't have been perching

Interrogative form

Simple form	V-ing form
must I perch? must you perch? must he perch? must we perch? must you perch? must they perch?	must I be perching? must you be perching? must he be perching? must we be perching? must you be perching? must they be perching?
Perfect	V-ing perfect
must I have perched? must you have perched? must he have perched? must we have perched? must you have perched? must they have perched?	must I have been perching? must you have been perching? must he have been perching? must we have been perching? must you have been perching? must they have been perching?

Interro-negative form

Simple form	V-ing form
mustn't I perch? mustn't you perch? mustn't he perch? mustn't we perch? mustn't you perch? mustn't they perch?	mustn't I be perching? mustn't you be perching? mustn't he be perching? mustn't we be perching? mustn't you be perching? mustn't they be perching?
Perfect	V-ing perfect
mustn't I have perched? mustn't you have perched? mustn't he have perched? mustn't we have perched? mustn't you have perched? mustn't they have perched?	mustn't I have been perching? mustn't you have been perching? mustn't he have been perching? mustn't we have been perching? mustn't you have been perching? mustn't they have been perching?