I must plane you must plane he must plane we must plane you must plane they must plane
V-ing form
I must be planing you must be planing he must be planing we must be planing you must be planing they must be planing
Perfect
I must have planed you must have planed he must have planed we must have planed you must have planed they must have planed
V-ing perfect
I must have been planing you must have been planing he must have been planing we must have been planing you must have been planing they must have been planing
Negation
Simple form
I must not plane you must not plane he must not plane we must not plane you must not plane they must not plane
V-ing form
I must not be planing you must not be planing he must not be planing we must not be planing you must not be planing they must not be planing
Perfect
I must not have planed you must not have planed he must not have planed we must not have planed you must not have planed they must not have planed
V-ing perfect
I must not have been planing you must not have been planing he must not have been planing we must not have been planing you must not have been planing they must not have been planing
Interrogative form
Simple form
must I plane? must you plane? must he plane? must we plane? must you plane? must they plane?
V-ing form
must I be planing? must you be planing? must he be planing? must we be planing? must you be planing? must they be planing?
Perfect
must I have planed? must you have planed? must he have planed? must we have planed? must you have planed? must they have planed?
V-ing perfect
must I have been planing? must you have been planing? must he have been planing? must we have been planing? must you have been planing? must they have been planing?
Interro-negative form
Simple form
must I not plane? must you not plane? must he not plane? must we not plane? must you not plane? must they not plane?
V-ing form
must I not be planing? must you not be planing? must he not be planing? must we not be planing? must you not be planing? must they not be planing?
Perfect
must I not have planed? must you not have planed? must he not have planed? must we not have planed? must you not have planed? must they not have planed?
V-ing perfect
must I not have been planing? must you not have been planing? must he not have been planing? must we not have been planing? must you not have been planing? must they not have been planing?