must smoulder
Regular verb: smoulder - smouldered- smouldered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must smoulder
you must smoulder
she must smoulder
we must smoulder
you must smoulder
they must smoulder 	I must be smouldering
you must be smouldering
she must be smouldering
we must be smouldering
you must be smouldering
they must be smouldering	I must have smouldered
you must have smouldered
she must have smouldered
we must have smouldered
you must have smouldered
they must have smouldered	I must have been smouldering
you must have been smouldering
she must have been smouldering
we must have been smouldering
you must have been smouldering
they must have been smouldering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't smoulder
you mustn't smoulder
she mustn't smoulder
we mustn't smoulder
you mustn't smoulder
they mustn't smoulder 	I mustn't be smouldering
you mustn't be smouldering
she mustn't be smouldering
we mustn't be smouldering
you mustn't be smouldering
they mustn't be smouldering	I mustn't have smouldered
you mustn't have smouldered
she mustn't have smouldered
we mustn't have smouldered
you mustn't have smouldered
they mustn't have smouldered	I mustn't have been smouldering
you mustn't have been smouldering
she mustn't have been smouldering
we mustn't have been smouldering
you mustn't have been smouldering
they mustn't have been smouldering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I smoulder?
must you smoulder?
must she smoulder?
must we smoulder?
must you smoulder?
must they smoulder? 	must I be smouldering?
must you be smouldering?
must she be smouldering?
must we be smouldering?
must you be smouldering?
must they be smouldering? 	must I have smouldered?
must you have smouldered?
must she have smouldered?
must we have smouldered?
must you have smouldered?
must they have smouldered? 	must I have been smouldering?
must you have been smouldering?
must she have been smouldering?
must we have been smouldering?
must you have been smouldering?
must they have been smouldering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I smoulder?
mustn't you smoulder?
mustn't she smoulder?
mustn't we smoulder?
mustn't you smoulder?
mustn't they smoulder? 	mustn't I be smouldering?
mustn't you be smouldering?
mustn't she be smouldering?
mustn't we be smouldering?
mustn't you be smouldering?
mustn't they be smouldering? 	mustn't I have smouldered?
mustn't you have smouldered?
mustn't she have smouldered?
mustn't we have smouldered?
mustn't you have smouldered?
mustn't they have smouldered? 	mustn't I have been smouldering?
mustn't you have been smouldering?
mustn't she have been smouldering?
mustn't we have been smouldering?
mustn't you have been smouldering?
mustn't they have been smouldering?