must forest
Regular verb: forest - forested- forested

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must forest
you must forest
he must forest
we must forest
you must forest
they must forest 	I must be foresting
you must be foresting
he must be foresting
we must be foresting
you must be foresting
they must be foresting	I must have forested
you must have forested
he must have forested
we must have forested
you must have forested
they must have forested	I must have been foresting
you must have been foresting
he must have been foresting
we must have been foresting
you must have been foresting
they must have been foresting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't forest
you mustn't forest
he mustn't forest
we mustn't forest
you mustn't forest
they mustn't forest 	I mustn't be foresting
you mustn't be foresting
he mustn't be foresting
we mustn't be foresting
you mustn't be foresting
they mustn't be foresting	I mustn't have forested
you mustn't have forested
he mustn't have forested
we mustn't have forested
you mustn't have forested
they mustn't have forested	I mustn't have been foresting
you mustn't have been foresting
he mustn't have been foresting
we mustn't have been foresting
you mustn't have been foresting
they mustn't have been foresting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I forest?
must you forest?
must he forest?
must we forest?
must you forest?
must they forest? 	must I be foresting?
must you be foresting?
must he be foresting?
must we be foresting?
must you be foresting?
must they be foresting? 	must I have forested?
must you have forested?
must he have forested?
must we have forested?
must you have forested?
must they have forested? 	must I have been foresting?
must you have been foresting?
must he have been foresting?
must we have been foresting?
must you have been foresting?
must they have been foresting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I forest?
mustn't you forest?
mustn't he forest?
mustn't we forest?
mustn't you forest?
mustn't they forest? 	mustn't I be foresting?
mustn't you be foresting?
mustn't he be foresting?
mustn't we be foresting?
mustn't you be foresting?
mustn't they be foresting? 	mustn't I have forested?
mustn't you have forested?
mustn't he have forested?
mustn't we have forested?
mustn't you have forested?
mustn't they have forested? 	mustn't I have been foresting?
mustn't you have been foresting?
mustn't he have been foresting?
mustn't we have been foresting?
mustn't you have been foresting?
mustn't they have been foresting?