English verb conjugation
MUST ANSWER

Regular verb: answer - answered - answered

Affirmation

Simple form	V-ing form
I must answer you must answer he must answer we must answer you must answer they must answer	I must be answering you must be answering he must be answering we must be answering you must be answering they must be answering
Perfect	V-ing perfect
I must have answered you must have answered he must have answered we must have answered you must have answered they must have answered	I must have been answering you must have been answering he must have been answering we must have been answering you must have been answering they must have been answering

Negation

Simple form	V-ing form
I mustn't answer you mustn't answer he mustn't answer we mustn't answer you mustn't answer they mustn't answer	I mustn't be answering you mustn't be answering he mustn't be answering we mustn't be answering you mustn't be answering they mustn't be answering
Perfect	V-ing perfect
I mustn't have answered you mustn't have answered he mustn't have answered we mustn't have answered you mustn't have answered they mustn't have answered	I mustn't have been answering you mustn't have been answering he mustn't have been answering we mustn't have been answering you mustn't have been answering they mustn't have been answering

Interrogative form

Simple form	V-ing form
must I answer? must you answer? must he answer? must we answer? must you answer? must they answer?	must I be answering? must you be answering? must he be answering? must we be answering? must you be answering? must they be answering?
Perfect	V-ing perfect
must I have answered? must you have answered? must he have answered? must we have answered? must you have answered? must they have answered?	must I have been answering? must you have been answering? must he have been answering? must we have been answering? must you have been answering? must they have been answering?

Interro-negative form

Simple form	V-ing form
mustn't I answer? mustn't you answer? mustn't he answer? mustn't we answer? mustn't you answer? mustn't they answer?	mustn't I be answering? mustn't you be answering? mustn't he be answering? mustn't we be answering? mustn't you be answering? mustn't they be answering?
Perfect	V-ing perfect
mustn't I have answered? mustn't you have answered? mustn't he have answered? mustn't we have answered? mustn't you have answered? mustn't they have answered?	mustn't I have been answering? mustn't you have been answering? mustn't he have been answering? mustn't we have been answering? mustn't you have been answering? mustn't they have been answering?