must smoulder
Regular verb: smoulder - smouldered- smouldered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must smoulder
you must smoulder
he must smoulder
we must smoulder
you must smoulder
they must smoulder 	I must be smouldering
you must be smouldering
he must be smouldering
we must be smouldering
you must be smouldering
they must be smouldering	I must have smouldered
you must have smouldered
he 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
he 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 must not smoulder
you must not smoulder
he must not smoulder
we must not smoulder
you must not smoulder
they must not smoulder 	I must not be smouldering
you must not be smouldering
he must not be smouldering
we must not be smouldering
you must not be smouldering
they must not be smouldering	I must not have smouldered
you must not have smouldered
he must not have smouldered
we must not have smouldered
you must not have smouldered
they must not have smouldered	I must not have been smouldering
you must not have been smouldering
he must not have been smouldering
we must not have been smouldering
you must not have been smouldering
they must not have been smouldering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I smoulder?
must you smoulder?
must he smoulder?
must we smoulder?
must you smoulder?
must they smoulder? 	must I be smouldering?
must you be smouldering?
must he be smouldering?
must we be smouldering?
must you be smouldering?
must they be smouldering? 	must I have smouldered?
must you have smouldered?
must he 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 he 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 	
must I not smoulder?
must you not smoulder?
must he not smoulder?
must we not smoulder?
must you not smoulder?
must they not smoulder? 	must I not be smouldering?
must you not be smouldering?
must he not be smouldering?
must we not be smouldering?
must you not be smouldering?
must they not be smouldering? 	must I not have smouldered?
must you not have smouldered?
must he not have smouldered?
must we not have smouldered?
must you not have smouldered?
must they not have smouldered? 	must I not have been smouldering?
must you not have been smouldering?
must he not have been smouldering?
must we not have been smouldering?
must you not have been smouldering?
must they not have been smouldering?