English verb conjugation
MUST MACHINE-STITCH

Regular verb: machine-stitch - machine-stitched - machine-stitched

Affirmation

Simple form	V-ing form
I must machine-stitch you must machine-stitch he must machine-stitch we must machine-stitch you must machine-stitch they must machine-stitch	I must be machine-stitching you must be machine-stitching he must be machine-stitching we must be machine-stitching you must be machine-stitching they must be machine-stitching
Perfect	V-ing perfect
I must have machine-stitched you must have machine-stitched he must have machine-stitched we must have machine-stitched you must have machine-stitched they must have machine-stitched	I must have been machine-stitching you must have been machine-stitching he must have been machine-stitching we must have been machine-stitching you must have been machine-stitching they must have been machine-stitching

Negation

Simple form	V-ing form
I mustn't machine-stitch you mustn't machine-stitch he mustn't machine-stitch we mustn't machine-stitch you mustn't machine-stitch they mustn't machine-stitch	I mustn't be machine-stitching you mustn't be machine-stitching he mustn't be machine-stitching we mustn't be machine-stitching you mustn't be machine-stitching they mustn't be machine-stitching
Perfect	V-ing perfect
I mustn't have machine-stitched you mustn't have machine-stitched he mustn't have machine-stitched we mustn't have machine-stitched you mustn't have machine-stitched they mustn't have machine-stitched	I mustn't have been machine-stitching you mustn't have been machine-stitching he mustn't have been machine-stitching we mustn't have been machine-stitching you mustn't have been machine-stitching they mustn't have been machine-stitching

Interrogative form

Simple form	V-ing form
must I machine-stitch? must you machine-stitch? must he machine-stitch? must we machine-stitch? must you machine-stitch? must they machine-stitch?	must I be machine-stitching? must you be machine-stitching? must he be machine-stitching? must we be machine-stitching? must you be machine-stitching? must they be machine-stitching?
Perfect	V-ing perfect
must I have machine-stitched? must you have machine-stitched? must he have machine-stitched? must we have machine-stitched? must you have machine-stitched? must they have machine-stitched?	must I have been machine-stitching? must you have been machine-stitching? must he have been machine-stitching? must we have been machine-stitching? must you have been machine-stitching? must they have been machine-stitching?

Interro-negative form

Simple form	V-ing form
mustn't I machine-stitch? mustn't you machine-stitch? mustn't he machine-stitch? mustn't we machine-stitch? mustn't you machine-stitch? mustn't they machine-stitch?	mustn't I be machine-stitching? mustn't you be machine-stitching? mustn't he be machine-stitching? mustn't we be machine-stitching? mustn't you be machine-stitching? mustn't they be machine-stitching?
Perfect	V-ing perfect
mustn't I have machine-stitched? mustn't you have machine-stitched? mustn't he have machine-stitched? mustn't we have machine-stitched? mustn't you have machine-stitched? mustn't they have machine-stitched?	mustn't I have been machine-stitching? mustn't you have been machine-stitching? mustn't he have been machine-stitching? mustn't we have been machine-stitching? mustn't you have been machine-stitching? mustn't they have been machine-stitching?