I must invert you must invert she must invert we must invert you must invert they must invert
V-ing form
I must be inverting you must be inverting she must be inverting we must be inverting you must be inverting they must be inverting
Perfect
I must have inverted you must have inverted she must have inverted we must have inverted you must have inverted they must have inverted
V-ing perfect
I must have been inverting you must have been inverting she must have been inverting we must have been inverting you must have been inverting they must have been inverting
Negation
Simple form
I must not invert you must not invert she must not invert we must not invert you must not invert they must not invert
V-ing form
I must not be inverting you must not be inverting she must not be inverting we must not be inverting you must not be inverting they must not be inverting
Perfect
I must not have inverted you must not have inverted she must not have inverted we must not have inverted you must not have inverted they must not have inverted
V-ing perfect
I must not have been inverting you must not have been inverting she must not have been inverting we must not have been inverting you must not have been inverting they must not have been inverting
Interrogative form
Simple form
must I invert? must you invert? must she invert? must we invert? must you invert? must they invert?
V-ing form
must I be inverting? must you be inverting? must she be inverting? must we be inverting? must you be inverting? must they be inverting?
Perfect
must I have inverted? must you have inverted? must she have inverted? must we have inverted? must you have inverted? must they have inverted?
V-ing perfect
must I have been inverting? must you have been inverting? must she have been inverting? must we have been inverting? must you have been inverting? must they have been inverting?
Interro-negative form
Simple form
must I not invert? must you not invert? must she not invert? must we not invert? must you not invert? must they not invert?
V-ing form
must I not be inverting? must you not be inverting? must she not be inverting? must we not be inverting? must you not be inverting? must they not be inverting?
Perfect
must I not have inverted? must you not have inverted? must she not have inverted? must we not have inverted? must you not have inverted? must they not have inverted?
V-ing perfect
must I not have been inverting? must you not have been inverting? must she not have been inverting? must we not have been inverting? must you not have been inverting? must they not have been inverting?