must abbreviate
Regular verb: abbreviate - abbreviated- abbreviated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must abbreviate
you must abbreviate
he must abbreviate
we must abbreviate
you must abbreviate
they must abbreviate 	I must be abbreviating
you must be abbreviating
he must be abbreviating
we must be abbreviating
you must be abbreviating
they must be abbreviating	I must have abbreviated
you must have abbreviated
he must have abbreviated
we must have abbreviated
you must have abbreviated
they must have abbreviated	I must have been abbreviating
you must have been abbreviating
he must have been abbreviating
we must have been abbreviating
you must have been abbreviating
they must have been abbreviating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't abbreviate
you mustn't abbreviate
he mustn't abbreviate
we mustn't abbreviate
you mustn't abbreviate
they mustn't abbreviate 	I mustn't be abbreviating
you mustn't be abbreviating
he mustn't be abbreviating
we mustn't be abbreviating
you mustn't be abbreviating
they mustn't be abbreviating	I mustn't have abbreviated
you mustn't have abbreviated
he mustn't have abbreviated
we mustn't have abbreviated
you mustn't have abbreviated
they mustn't have abbreviated	I mustn't have been abbreviating
you mustn't have been abbreviating
he mustn't have been abbreviating
we mustn't have been abbreviating
you mustn't have been abbreviating
they mustn't have been abbreviating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I abbreviate?
must you abbreviate?
must he abbreviate?
must we abbreviate?
must you abbreviate?
must they abbreviate? 	must I be abbreviating?
must you be abbreviating?
must he be abbreviating?
must we be abbreviating?
must you be abbreviating?
must they be abbreviating? 	must I have abbreviated?
must you have abbreviated?
must he have abbreviated?
must we have abbreviated?
must you have abbreviated?
must they have abbreviated? 	must I have been abbreviating?
must you have been abbreviating?
must he have been abbreviating?
must we have been abbreviating?
must you have been abbreviating?
must they have been abbreviating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I abbreviate?
mustn't you abbreviate?
mustn't he abbreviate?
mustn't we abbreviate?
mustn't you abbreviate?
mustn't they abbreviate? 	mustn't I be abbreviating?
mustn't you be abbreviating?
mustn't he be abbreviating?
mustn't we be abbreviating?
mustn't you be abbreviating?
mustn't they be abbreviating? 	mustn't I have abbreviated?
mustn't you have abbreviated?
mustn't he have abbreviated?
mustn't we have abbreviated?
mustn't you have abbreviated?
mustn't they have abbreviated? 	mustn't I have been abbreviating?
mustn't you have been abbreviating?
mustn't he have been abbreviating?
mustn't we have been abbreviating?
mustn't you have been abbreviating?
mustn't they have been abbreviating?