must carburet
Regular verb: carburet - carbureted- carbureted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must carburet
you must carburet
he must carburet
we must carburet
you must carburet
they must carburet 	I must be carbureting
you must be carbureting
he must be carbureting
we must be carbureting
you must be carbureting
they must be carbureting	I must have carbureted
you must have carbureted
he must have carbureted
we must have carbureted
you must have carbureted
they must have carbureted	I must have been carbureting
you must have been carbureting
he must have been carbureting
we must have been carbureting
you must have been carbureting
they must have been carbureting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't carburet
you mustn't carburet
he mustn't carburet
we mustn't carburet
you mustn't carburet
they mustn't carburet 	I mustn't be carbureting
you mustn't be carbureting
he mustn't be carbureting
we mustn't be carbureting
you mustn't be carbureting
they mustn't be carbureting	I mustn't have carbureted
you mustn't have carbureted
he mustn't have carbureted
we mustn't have carbureted
you mustn't have carbureted
they mustn't have carbureted	I mustn't have been carbureting
you mustn't have been carbureting
he mustn't have been carbureting
we mustn't have been carbureting
you mustn't have been carbureting
they mustn't have been carbureting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I carburet?
must you carburet?
must he carburet?
must we carburet?
must you carburet?
must they carburet? 	must I be carbureting?
must you be carbureting?
must he be carbureting?
must we be carbureting?
must you be carbureting?
must they be carbureting? 	must I have carbureted?
must you have carbureted?
must he have carbureted?
must we have carbureted?
must you have carbureted?
must they have carbureted? 	must I have been carbureting?
must you have been carbureting?
must he have been carbureting?
must we have been carbureting?
must you have been carbureting?
must they have been carbureting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I carburet?
mustn't you carburet?
mustn't he carburet?
mustn't we carburet?
mustn't you carburet?
mustn't they carburet? 	mustn't I be carbureting?
mustn't you be carbureting?
mustn't he be carbureting?
mustn't we be carbureting?
mustn't you be carbureting?
mustn't they be carbureting? 	mustn't I have carbureted?
mustn't you have carbureted?
mustn't he have carbureted?
mustn't we have carbureted?
mustn't you have carbureted?
mustn't they have carbureted? 	mustn't I have been carbureting?
mustn't you have been carbureting?
mustn't he have been carbureting?
mustn't we have been carbureting?
mustn't you have been carbureting?
mustn't they have been carbureting?