I must knot you must knot he must knot we must knot you must knot they must knot
V-ing form
I must be knotting you must be knotting he must be knotting we must be knotting you must be knotting they must be knotting
Perfect
I must have knotted you must have knotted he must have knotted we must have knotted you must have knotted they must have knotted
V-ing perfect
I must have been knotting you must have been knotting he must have been knotting we must have been knotting you must have been knotting they must have been knotting
Negation
Simple form
I must not knot you must not knot he must not knot we must not knot you must not knot they must not knot
V-ing form
I must not be knotting you must not be knotting he must not be knotting we must not be knotting you must not be knotting they must not be knotting
Perfect
I must not have knotted you must not have knotted he must not have knotted we must not have knotted you must not have knotted they must not have knotted
V-ing perfect
I must not have been knotting you must not have been knotting he must not have been knotting we must not have been knotting you must not have been knotting they must not have been knotting
Interrogative form
Simple form
must I knot? must you knot? must he knot? must we knot? must you knot? must they knot?
V-ing form
must I be knotting? must you be knotting? must he be knotting? must we be knotting? must you be knotting? must they be knotting?
Perfect
must I have knotted? must you have knotted? must he have knotted? must we have knotted? must you have knotted? must they have knotted?
V-ing perfect
must I have been knotting? must you have been knotting? must he have been knotting? must we have been knotting? must you have been knotting? must they have been knotting?
Interro-negative form
Simple form
must I not knot? must you not knot? must he not knot? must we not knot? must you not knot? must they not knot?
V-ing form
must I not be knotting? must you not be knotting? must he not be knotting? must we not be knotting? must you not be knotting? must they not be knotting?
Perfect
must I not have knotted? must you not have knotted? must he not have knotted? must we not have knotted? must you not have knotted? must they not have knotted?
V-ing perfect
must I not have been knotting? must you not have been knotting? must he not have been knotting? must we not have been knotting? must you not have been knotting? must they not have been knotting?