must clam
Regular verb: clam - clamed- clamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must clam
you must clam
he must clam
we must clam
you must clam
they must clam 	I must be claming
you must be claming
he must be claming
we must be claming
you must be claming
they must be claming	I must have clamed
you must have clamed
he must have clamed
we must have clamed
you must have clamed
they must have clamed	I must have been claming
you must have been claming
he must have been claming
we must have been claming
you must have been claming
they must have been claming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't clam
you mustn't clam
he mustn't clam
we mustn't clam
you mustn't clam
they mustn't clam 	I mustn't be claming
you mustn't be claming
he mustn't be claming
we mustn't be claming
you mustn't be claming
they mustn't be claming	I mustn't have clamed
you mustn't have clamed
he mustn't have clamed
we mustn't have clamed
you mustn't have clamed
they mustn't have clamed	I mustn't have been claming
you mustn't have been claming
he mustn't have been claming
we mustn't have been claming
you mustn't have been claming
they mustn't have been claming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I clam?
must you clam?
must he clam?
must we clam?
must you clam?
must they clam? 	must I be claming?
must you be claming?
must he be claming?
must we be claming?
must you be claming?
must they be claming? 	must I have clamed?
must you have clamed?
must he have clamed?
must we have clamed?
must you have clamed?
must they have clamed? 	must I have been claming?
must you have been claming?
must he have been claming?
must we have been claming?
must you have been claming?
must they have been claming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I clam?
mustn't you clam?
mustn't he clam?
mustn't we clam?
mustn't you clam?
mustn't they clam? 	mustn't I be claming?
mustn't you be claming?
mustn't he be claming?
mustn't we be claming?
mustn't you be claming?
mustn't they be claming? 	mustn't I have clamed?
mustn't you have clamed?
mustn't he have clamed?
mustn't we have clamed?
mustn't you have clamed?
mustn't they have clamed? 	mustn't I have been claming?
mustn't you have been claming?
mustn't he have been claming?
mustn't we have been claming?
mustn't you have been claming?
mustn't they have been claming?