must degrease
Regular verb: degrease - degreased- degreased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must degrease
you must degrease
he must degrease
we must degrease
you must degrease
they must degrease 	I must be degreasing
you must be degreasing
he must be degreasing
we must be degreasing
you must be degreasing
they must be degreasing	I must have degreased
you must have degreased
he must have degreased
we must have degreased
you must have degreased
they must have degreased	I must have been degreasing
you must have been degreasing
he must have been degreasing
we must have been degreasing
you must have been degreasing
they must have been degreasing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't degrease
you mustn't degrease
he mustn't degrease
we mustn't degrease
you mustn't degrease
they mustn't degrease 	I mustn't be degreasing
you mustn't be degreasing
he mustn't be degreasing
we mustn't be degreasing
you mustn't be degreasing
they mustn't be degreasing	I mustn't have degreased
you mustn't have degreased
he mustn't have degreased
we mustn't have degreased
you mustn't have degreased
they mustn't have degreased	I mustn't have been degreasing
you mustn't have been degreasing
he mustn't have been degreasing
we mustn't have been degreasing
you mustn't have been degreasing
they mustn't have been degreasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I degrease?
must you degrease?
must he degrease?
must we degrease?
must you degrease?
must they degrease? 	must I be degreasing?
must you be degreasing?
must he be degreasing?
must we be degreasing?
must you be degreasing?
must they be degreasing? 	must I have degreased?
must you have degreased?
must he have degreased?
must we have degreased?
must you have degreased?
must they have degreased? 	must I have been degreasing?
must you have been degreasing?
must he have been degreasing?
must we have been degreasing?
must you have been degreasing?
must they have been degreasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I degrease?
mustn't you degrease?
mustn't he degrease?
mustn't we degrease?
mustn't you degrease?
mustn't they degrease? 	mustn't I be degreasing?
mustn't you be degreasing?
mustn't he be degreasing?
mustn't we be degreasing?
mustn't you be degreasing?
mustn't they be degreasing? 	mustn't I have degreased?
mustn't you have degreased?
mustn't he have degreased?
mustn't we have degreased?
mustn't you have degreased?
mustn't they have degreased? 	mustn't I have been degreasing?
mustn't you have been degreasing?
mustn't he have been degreasing?
mustn't we have been degreasing?
mustn't you have been degreasing?
mustn't they have been degreasing?