I must lean you must lean she must lean we must lean you must lean they must lean
V-ing form
I must be leaning you must be leaning she must be leaning we must be leaning you must be leaning they must be leaning
Perfect
I must have leaned you must have leaned she must have leaned we must have leaned you must have leaned they must have leaned
V-ing perfect
I must have been leaning you must have been leaning she must have been leaning we must have been leaning you must have been leaning they must have been leaning
Negation
Simple form
I must not lean you must not lean she must not lean we must not lean you must not lean they must not lean
V-ing form
I must not be leaning you must not be leaning she must not be leaning we must not be leaning you must not be leaning they must not be leaning
Perfect
I must not have leaned you must not have leaned she must not have leaned we must not have leaned you must not have leaned they must not have leaned
V-ing perfect
I must not have been leaning you must not have been leaning she must not have been leaning we must not have been leaning you must not have been leaning they must not have been leaning
Interrogative form
Simple form
must I lean? must you lean? must she lean? must we lean? must you lean? must they lean?
V-ing form
must I be leaning? must you be leaning? must she be leaning? must we be leaning? must you be leaning? must they be leaning?
Perfect
must I have leaned? must you have leaned? must she have leaned? must we have leaned? must you have leaned? must they have leaned?
V-ing perfect
must I have been leaning? must you have been leaning? must she have been leaning? must we have been leaning? must you have been leaning? must they have been leaning?
Interro-negative form
Simple form
must I not lean? must you not lean? must she not lean? must we not lean? must you not lean? must they not lean?
V-ing form
must I not be leaning? must you not be leaning? must she not be leaning? must we not be leaning? must you not be leaning? must they not be leaning?
Perfect
must I not have leaned? must you not have leaned? must she not have leaned? must we not have leaned? must you not have leaned? must they not have leaned?
V-ing perfect
must I not have been leaning? must you not have been leaning? must she not have been leaning? must we not have been leaning? must you not have been leaning? must they not have been leaning?