must describe
Regular verb: describe - described- described

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