must pebble
Regular verb: pebble - pebbled- pebbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pebble
you must pebble
he must pebble
we must pebble
you must pebble
they must pebble 	I must be pebbling
you must be pebbling
he must be pebbling
we must be pebbling
you must be pebbling
they must be pebbling	I must have pebbled
you must have pebbled
he must have pebbled
we must have pebbled
you must have pebbled
they must have pebbled	I must have been pebbling
you must have been pebbling
he must have been pebbling
we must have been pebbling
you must have been pebbling
they must have been pebbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't pebble
you mustn't pebble
he mustn't pebble
we mustn't pebble
you mustn't pebble
they mustn't pebble 	I mustn't be pebbling
you mustn't be pebbling
he mustn't be pebbling
we mustn't be pebbling
you mustn't be pebbling
they mustn't be pebbling	I mustn't have pebbled
you mustn't have pebbled
he mustn't have pebbled
we mustn't have pebbled
you mustn't have pebbled
they mustn't have pebbled	I mustn't have been pebbling
you mustn't have been pebbling
he mustn't have been pebbling
we mustn't have been pebbling
you mustn't have been pebbling
they mustn't have been pebbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pebble?
must you pebble?
must he pebble?
must we pebble?
must you pebble?
must they pebble? 	must I be pebbling?
must you be pebbling?
must he be pebbling?
must we be pebbling?
must you be pebbling?
must they be pebbling? 	must I have pebbled?
must you have pebbled?
must he have pebbled?
must we have pebbled?
must you have pebbled?
must they have pebbled? 	must I have been pebbling?
must you have been pebbling?
must he have been pebbling?
must we have been pebbling?
must you have been pebbling?
must they have been pebbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I pebble?
mustn't you pebble?
mustn't he pebble?
mustn't we pebble?
mustn't you pebble?
mustn't they pebble? 	mustn't I be pebbling?
mustn't you be pebbling?
mustn't he be pebbling?
mustn't we be pebbling?
mustn't you be pebbling?
mustn't they be pebbling? 	mustn't I have pebbled?
mustn't you have pebbled?
mustn't he have pebbled?
mustn't we have pebbled?
mustn't you have pebbled?
mustn't they have pebbled? 	mustn't I have been pebbling?
mustn't you have been pebbling?
mustn't he have been pebbling?
mustn't we have been pebbling?
mustn't you have been pebbling?
mustn't they have been pebbling?