English verb conjugation
MUST BACKSTITCH

Regular verb: backstitch - backstitched - backstitched

Affirmation

Simple form	V-ing form
I must backstitch you must backstitch he must backstitch we must backstitch you must backstitch they must backstitch	I must be backstitching you must be backstitching he must be backstitching we must be backstitching you must be backstitching they must be backstitching
Perfect	V-ing perfect
I must have backstitched you must have backstitched he must have backstitched we must have backstitched you must have backstitched they must have backstitched	I must have been backstitching you must have been backstitching he must have been backstitching we must have been backstitching you must have been backstitching they must have been backstitching

Negation

Simple form	V-ing form
I must not backstitch you must not backstitch he must not backstitch we must not backstitch you must not backstitch they must not backstitch	I must not be backstitching you must not be backstitching he must not be backstitching we must not be backstitching you must not be backstitching they must not be backstitching
Perfect	V-ing perfect
I must not have backstitched you must not have backstitched he must not have backstitched we must not have backstitched you must not have backstitched they must not have backstitched	I must not have been backstitching you must not have been backstitching he must not have been backstitching we must not have been backstitching you must not have been backstitching they must not have been backstitching

Interrogative form

Simple form	V-ing form
must I backstitch? must you backstitch? must he backstitch? must we backstitch? must you backstitch? must they backstitch?	must I be backstitching? must you be backstitching? must he be backstitching? must we be backstitching? must you be backstitching? must they be backstitching?
Perfect	V-ing perfect
must I have backstitched? must you have backstitched? must he have backstitched? must we have backstitched? must you have backstitched? must they have backstitched?	must I have been backstitching? must you have been backstitching? must he have been backstitching? must we have been backstitching? must you have been backstitching? must they have been backstitching?

Interro-negative form

Simple form	V-ing form
must I not backstitch? must you not backstitch? must he not backstitch? must we not backstitch? must you not backstitch? must they not backstitch?	must I not be backstitching? must you not be backstitching? must he not be backstitching? must we not be backstitching? must you not be backstitching? must they not be backstitching?
Perfect	V-ing perfect
must I not have backstitched? must you not have backstitched? must he not have backstitched? must we not have backstitched? must you not have backstitched? must they not have backstitched?	must I not have been backstitching? must you not have been backstitching? must he not have been backstitching? must we not have been backstitching? must you not have been backstitching? must they not have been backstitching?