I must japan you must japan she must japan we must japan you must japan they must japan
V-ing form
I must be japaning you must be japaning she must be japaning we must be japaning you must be japaning they must be japaning
Perfect
I must have japaned you must have japaned she must have japaned we must have japaned you must have japaned they must have japaned
V-ing perfect
I must have been japaning you must have been japaning she must have been japaning we must have been japaning you must have been japaning they must have been japaning
Negation
Simple form
I must not japan you must not japan she must not japan we must not japan you must not japan they must not japan
V-ing form
I must not be japaning you must not be japaning she must not be japaning we must not be japaning you must not be japaning they must not be japaning
Perfect
I must not have japaned you must not have japaned she must not have japaned we must not have japaned you must not have japaned they must not have japaned
V-ing perfect
I must not have been japaning you must not have been japaning she must not have been japaning we must not have been japaning you must not have been japaning they must not have been japaning
Interrogative form
Simple form
must I japan? must you japan? must she japan? must we japan? must you japan? must they japan?
V-ing form
must I be japaning? must you be japaning? must she be japaning? must we be japaning? must you be japaning? must they be japaning?
Perfect
must I have japaned? must you have japaned? must she have japaned? must we have japaned? must you have japaned? must they have japaned?
V-ing perfect
must I have been japaning? must you have been japaning? must she have been japaning? must we have been japaning? must you have been japaning? must they have been japaning?
Interro-negative form
Simple form
must I not japan? must you not japan? must she not japan? must we not japan? must you not japan? must they not japan?
V-ing form
must I not be japaning? must you not be japaning? must she not be japaning? must we not be japaning? must you not be japaning? must they not be japaning?
Perfect
must I not have japaned? must you not have japaned? must she not have japaned? must we not have japaned? must you not have japaned? must they not have japaned?
V-ing perfect
must I not have been japaning? must you not have been japaning? must she not have been japaning? must we not have been japaning? must you not have been japaning? must they not have been japaning?