must clabber
Verbo regular: clabber - clabbered- clabbered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must clabber
you must clabber
she must clabber
we must clabber
you must clabber
they must clabber 	I must be clabbering
you must be clabbering
she must be clabbering
we must be clabbering
you must be clabbering
they must be clabbering	I must have clabbered
you must have clabbered
she must have clabbered
we must have clabbered
you must have clabbered
they must have clabbered	I must have been clabbering
you must have been clabbering
she must have been clabbering
we must have been clabbering
you must have been clabbering
they must have been clabbering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not clabber
you must not clabber
she must not clabber
we must not clabber
you must not clabber
they must not clabber 	I must not be clabbering
you must not be clabbering
she must not be clabbering
we must not be clabbering
you must not be clabbering
they must not be clabbering	I must not have clabbered
you must not have clabbered
she must not have clabbered
we must not have clabbered
you must not have clabbered
they must not have clabbered	I must not have been clabbering
you must not have been clabbering
she must not have been clabbering
we must not have been clabbering
you must not have been clabbering
they must not have been clabbering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I clabber?
must you clabber?
must she clabber?
must we clabber?
must you clabber?
must they clabber? 	must I be clabbering?
must you be clabbering?
must she be clabbering?
must we be clabbering?
must you be clabbering?
must they be clabbering? 	must I have clabbered?
must you have clabbered?
must she have clabbered?
must we have clabbered?
must you have clabbered?
must they have clabbered? 	must I have been clabbering?
must you have been clabbering?
must she have been clabbering?
must we have been clabbering?
must you have been clabbering?
must they have been clabbering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not clabber?
must you not clabber?
must she not clabber?
must we not clabber?
must you not clabber?
must they not clabber? 	must I not be clabbering?
must you not be clabbering?
must she not be clabbering?
must we not be clabbering?
must you not be clabbering?
must they not be clabbering? 	must I not have clabbered?
must you not have clabbered?
must she not have clabbered?
must we not have clabbered?
must you not have clabbered?
must they not have clabbered? 	must I not have been clabbering?
must you not have been clabbering?
must she not have been clabbering?
must we not have been clabbering?
must you not have been clabbering?
must they not have been clabbering?