I must lift you must lift she must lift we must lift you must lift they must lift
V-ing form
I must be lifting you must be lifting she must be lifting we must be lifting you must be lifting they must be lifting
Perfect
I must have lifted you must have lifted she must have lifted we must have lifted you must have lifted they must have lifted
V-ing perfect
I must have been lifting you must have been lifting she must have been lifting we must have been lifting you must have been lifting they must have been lifting
Negation
Simple form
I must not lift you must not lift she must not lift we must not lift you must not lift they must not lift
V-ing form
I must not be lifting you must not be lifting she must not be lifting we must not be lifting you must not be lifting they must not be lifting
Perfect
I must not have lifted you must not have lifted she must not have lifted we must not have lifted you must not have lifted they must not have lifted
V-ing perfect
I must not have been lifting you must not have been lifting she must not have been lifting we must not have been lifting you must not have been lifting they must not have been lifting
Interrogative form
Simple form
must I lift? must you lift? must she lift? must we lift? must you lift? must they lift?
V-ing form
must I be lifting? must you be lifting? must she be lifting? must we be lifting? must you be lifting? must they be lifting?
Perfect
must I have lifted? must you have lifted? must she have lifted? must we have lifted? must you have lifted? must they have lifted?
V-ing perfect
must I have been lifting? must you have been lifting? must she have been lifting? must we have been lifting? must you have been lifting? must they have been lifting?
Interro-negative form
Simple form
must I not lift? must you not lift? must she not lift? must we not lift? must you not lift? must they not lift?
V-ing form
must I not be lifting? must you not be lifting? must she not be lifting? must we not be lifting? must you not be lifting? must they not be lifting?
Perfect
must I not have lifted? must you not have lifted? must she not have lifted? must we not have lifted? must you not have lifted? must they not have lifted?
V-ing perfect
must I not have been lifting? must you not have been lifting? must she not have been lifting? must we not have been lifting? must you not have been lifting? must they not have been lifting?