must plane
Regular verb: plane - planed- planed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must plane
you must plane
he must plane
we must plane
you must plane
they must plane 	I must be planing
you must be planing
he must be planing
we must be planing
you must be planing
they must be planing	I must have planed
you must have planed
he must have planed
we must have planed
you must have planed
they must have planed	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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't plane
you mustn't plane
he mustn't plane
we mustn't plane
you mustn't plane
they mustn't plane 	I mustn't be planing
you mustn't be planing
he mustn't be planing
we mustn't be planing
you mustn't be planing
they mustn't be planing	I mustn't have planed
you mustn't have planed
he mustn't have planed
we mustn't have planed
you mustn't have planed
they mustn't have planed	I mustn't have been planing
you mustn't have been planing
he mustn't have been planing
we mustn't have been planing
you mustn't have been planing
they mustn't have been planing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I plane?
must you plane?
must he plane?
must we plane?
must you plane?
must they plane? 	must I be planing?
must you be planing?
must he be planing?
must we be planing?
must you be planing?
must they be planing? 	must I have planed?
must you have planed?
must he have planed?
must we have planed?
must you have planed?
must they have planed? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I plane?
mustn't you plane?
mustn't he plane?
mustn't we plane?
mustn't you plane?
mustn't they plane? 	mustn't I be planing?
mustn't you be planing?
mustn't he be planing?
mustn't we be planing?
mustn't you be planing?
mustn't they be planing? 	mustn't I have planed?
mustn't you have planed?
mustn't he have planed?
mustn't we have planed?
mustn't you have planed?
mustn't they have planed? 	mustn't I have been planing?
mustn't you have been planing?
mustn't he have been planing?
mustn't we have been planing?
mustn't you have been planing?
mustn't they have been planing?