English verb conjugation
MUST ETCH

Regular verb: etch - etched - etched

Affirmation

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