English verb conjugation
MUST DESCRIBE

Regular verb: describe - described - described

Affirmation

Simple form	V-ing form
I must describe you must describe he must describe we must describe you must describe they must describe	I must be describing you must be describing he must be describing we must be describing you must be describing they must be describing
Perfect	V-ing perfect
I must have described you must have described he must have described we must have described you must have described they must have described	I must have been describing you must have been describing he must have been describing we must have been describing you must have been describing they must have been describing

Negation

Simple form	V-ing form
I mustn't describe you mustn't describe he mustn't describe we mustn't describe you mustn't describe they mustn't describe	I mustn't be describing you mustn't be describing he mustn't be describing we mustn't be describing you mustn't be describing they mustn't be describing
Perfect	V-ing perfect
I mustn't have described you mustn't have described he mustn't have described we mustn't have described you mustn't have described they mustn't have described	I mustn't have been describing you mustn't have been describing he mustn't have been describing we mustn't have been describing you mustn't have been describing they mustn't have been describing

Interrogative form

Simple form	V-ing form
must I describe? must you describe? must he describe? must we describe? must you describe? must they describe?	must I be describing? must you be describing? must he be describing? must we be describing? must you be describing? must they be describing?
Perfect	V-ing perfect
must I have described? must you have described? must he have described? must we have described? must you have described? must they have described?	must I have been describing? must you have been describing? must he have been describing? must we have been describing? must you have been describing? must they have been describing?

Interro-negative form

Simple form	V-ing form
mustn't I describe? mustn't you describe? mustn't he describe? mustn't we describe? mustn't you describe? mustn't they describe?	mustn't I be describing? mustn't you be describing? mustn't he be describing? mustn't we be describing? mustn't you be describing? mustn't they be describing?
Perfect	V-ing perfect
mustn't I have described? mustn't you have described? mustn't he have described? mustn't we have described? mustn't you have described? mustn't they have described?	mustn't I have been describing? mustn't you have been describing? mustn't he have been describing? mustn't we have been describing? mustn't you have been describing? mustn't they have been describing?