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 she 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 she 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 she 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 she 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 must not machine-stitch you must not machine-stitch she must not machine-stitch we must not machine-stitch you must not machine-stitch they must not machine-stitch	I must not be machine-stitching you must not be machine-stitching she must not be machine-stitching we must not be machine-stitching you must not be machine-stitching they must not be machine-stitching
Perfect	V-ing perfect
I must not have machine-stitched you must not have machine-stitched she must not have machine-stitched we must not have machine-stitched you must not have machine-stitched they must not have machine-stitched	I must not have been machine-stitching you must not have been machine-stitching she must not have been machine-stitching we must not have been machine-stitching you must not have been machine-stitching they must not have been machine-stitching

Interrogative form

Simple form	V-ing form
must I machine-stitch? must you machine-stitch? must she 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 she 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 she 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 she 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
must I not machine-stitch? must you not machine-stitch? must she not machine-stitch? must we not machine-stitch? must you not machine-stitch? must they not machine-stitch?	must I not be machine-stitching? must you not be machine-stitching? must she not be machine-stitching? must we not be machine-stitching? must you not be machine-stitching? must they not be machine-stitching?
Perfect	V-ing perfect
must I not have machine-stitched? must you not have machine-stitched? must she not have machine-stitched? must we not have machine-stitched? must you not have machine-stitched? must they not have machine-stitched?	must I not have been machine-stitching? must you not have been machine-stitching? must she not have been machine-stitching? must we not have been machine-stitching? must you not have been machine-stitching? must they not have been machine-stitching?