I must scheme you must scheme she must scheme we must scheme you must scheme they must scheme
V-ing form
I must be scheming you must be scheming she must be scheming we must be scheming you must be scheming they must be scheming
Perfect
I must have schemed you must have schemed she must have schemed we must have schemed you must have schemed they must have schemed
V-ing perfect
I must have been scheming you must have been scheming she must have been scheming we must have been scheming you must have been scheming they must have been scheming
Negation
Simple form
I must not scheme you must not scheme she must not scheme we must not scheme you must not scheme they must not scheme
V-ing form
I must not be scheming you must not be scheming she must not be scheming we must not be scheming you must not be scheming they must not be scheming
Perfect
I must not have schemed you must not have schemed she must not have schemed we must not have schemed you must not have schemed they must not have schemed
V-ing perfect
I must not have been scheming you must not have been scheming she must not have been scheming we must not have been scheming you must not have been scheming they must not have been scheming
Interrogative form
Simple form
must I scheme? must you scheme? must she scheme? must we scheme? must you scheme? must they scheme?
V-ing form
must I be scheming? must you be scheming? must she be scheming? must we be scheming? must you be scheming? must they be scheming?
Perfect
must I have schemed? must you have schemed? must she have schemed? must we have schemed? must you have schemed? must they have schemed?
V-ing perfect
must I have been scheming? must you have been scheming? must she have been scheming? must we have been scheming? must you have been scheming? must they have been scheming?
Interro-negative form
Simple form
must I not scheme? must you not scheme? must she not scheme? must we not scheme? must you not scheme? must they not scheme?
V-ing form
must I not be scheming? must you not be scheming? must she not be scheming? must we not be scheming? must you not be scheming? must they not be scheming?
Perfect
must I not have schemed? must you not have schemed? must she not have schemed? must we not have schemed? must you not have schemed? must they not have schemed?
V-ing perfect
must I not have been scheming? must you not have been scheming? must she not have been scheming? must we not have been scheming? must you not have been scheming? must they not have been scheming?