English verb conjugation
MUST ETCH

Regular verb: etch - etched - etched

Affirmation

Simple form	V-ing form
I must etch you must etch he must etch we must etch you must etch they must etch	I must be etching you must be etching he must be etching we must be etching you must be etching they must be etching
Perfect	V-ing perfect
I must have etched you must have etched he must have etched we must have etched you must have etched they must have etched	I must have been etching you must have been etching he must have been etching we must have been etching you must have been etching they must have been etching

Negation

Simple form	V-ing form
I mustn't etch you mustn't etch he mustn't etch we mustn't etch you mustn't etch they mustn't etch	I mustn't be etching you mustn't be etching he mustn't be etching we mustn't be etching you mustn't be etching they mustn't be etching
Perfect	V-ing perfect
I mustn't have etched you mustn't have etched he mustn't have etched we mustn't have etched you mustn't have etched they mustn't have etched	I mustn't have been etching you mustn't have been etching he mustn't have been etching we mustn't have been etching you mustn't have been etching they mustn't have been etching

Interrogative form

Simple form	V-ing form
must I etch? must you etch? must he etch? must we etch? must you etch? must they etch?	must I be etching? must you be etching? must he be etching? must we be etching? must you be etching? must they be etching?
Perfect	V-ing perfect
must I have etched? must you have etched? must he have etched? must we have etched? must you have etched? must they have etched?	must I have been etching? must you have been etching? must he have been etching? must we have been etching? must you have been etching? must they have been etching?

Interro-negative form

Simple form	V-ing form
mustn't I etch? mustn't you etch? mustn't he etch? mustn't we etch? mustn't you etch? mustn't they etch?	mustn't I be etching? mustn't you be etching? mustn't he be etching? mustn't we be etching? mustn't you be etching? mustn't they be etching?
Perfect	V-ing perfect
mustn't I have etched? mustn't you have etched? mustn't he have etched? mustn't we have etched? mustn't you have etched? mustn't they have etched?	mustn't I have been etching? mustn't you have been etching? mustn't he have been etching? mustn't we have been etching? mustn't you have been etching? mustn't they have been etching?