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