must backcomb
Regular verb: backcomb - backcombed- backcombed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must backcomb
you must backcomb
he must backcomb
we must backcomb
you must backcomb
they must backcomb 	I must be backcombing
you must be backcombing
he must be backcombing
we must be backcombing
you must be backcombing
they must be backcombing	I must have backcombed
you must have backcombed
he must have backcombed
we must have backcombed
you must have backcombed
they must have backcombed	I must have been backcombing
you must have been backcombing
he must have been backcombing
we must have been backcombing
you must have been backcombing
they must have been backcombing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't backcomb
you mustn't backcomb
he mustn't backcomb
we mustn't backcomb
you mustn't backcomb
they mustn't backcomb 	I mustn't be backcombing
you mustn't be backcombing
he mustn't be backcombing
we mustn't be backcombing
you mustn't be backcombing
they mustn't be backcombing	I mustn't have backcombed
you mustn't have backcombed
he mustn't have backcombed
we mustn't have backcombed
you mustn't have backcombed
they mustn't have backcombed	I mustn't have been backcombing
you mustn't have been backcombing
he mustn't have been backcombing
we mustn't have been backcombing
you mustn't have been backcombing
they mustn't have been backcombing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I backcomb?
must you backcomb?
must he backcomb?
must we backcomb?
must you backcomb?
must they backcomb? 	must I be backcombing?
must you be backcombing?
must he be backcombing?
must we be backcombing?
must you be backcombing?
must they be backcombing? 	must I have backcombed?
must you have backcombed?
must he have backcombed?
must we have backcombed?
must you have backcombed?
must they have backcombed? 	must I have been backcombing?
must you have been backcombing?
must he have been backcombing?
must we have been backcombing?
must you have been backcombing?
must they have been backcombing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I backcomb?
mustn't you backcomb?
mustn't he backcomb?
mustn't we backcomb?
mustn't you backcomb?
mustn't they backcomb? 	mustn't I be backcombing?
mustn't you be backcombing?
mustn't he be backcombing?
mustn't we be backcombing?
mustn't you be backcombing?
mustn't they be backcombing? 	mustn't I have backcombed?
mustn't you have backcombed?
mustn't he have backcombed?
mustn't we have backcombed?
mustn't you have backcombed?
mustn't they have backcombed? 	mustn't I have been backcombing?
mustn't you have been backcombing?
mustn't he have been backcombing?
mustn't we have been backcombing?
mustn't you have been backcombing?
mustn't they have been backcombing?