must embrittle
Verbo regular: embrittle - embrittled- embrittled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must embrittle
you must embrittle
he must embrittle
we must embrittle
you must embrittle
they must embrittle 	I must be embrittling
you must be embrittling
he must be embrittling
we must be embrittling
you must be embrittling
they must be embrittling	I must have embrittled
you must have embrittled
he must have embrittled
we must have embrittled
you must have embrittled
they must have embrittled	I must have been embrittling
you must have been embrittling
he must have been embrittling
we must have been embrittling
you must have been embrittling
they must have been embrittling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not embrittle
you must not embrittle
he must not embrittle
we must not embrittle
you must not embrittle
they must not embrittle 	I must not be embrittling
you must not be embrittling
he must not be embrittling
we must not be embrittling
you must not be embrittling
they must not be embrittling	I must not have embrittled
you must not have embrittled
he must not have embrittled
we must not have embrittled
you must not have embrittled
they must not have embrittled	I must not have been embrittling
you must not have been embrittling
he must not have been embrittling
we must not have been embrittling
you must not have been embrittling
they must not have been embrittling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I embrittle?
must you embrittle?
must he embrittle?
must we embrittle?
must you embrittle?
must they embrittle? 	must I be embrittling?
must you be embrittling?
must he be embrittling?
must we be embrittling?
must you be embrittling?
must they be embrittling? 	must I have embrittled?
must you have embrittled?
must he have embrittled?
must we have embrittled?
must you have embrittled?
must they have embrittled? 	must I have been embrittling?
must you have been embrittling?
must he have been embrittling?
must we have been embrittling?
must you have been embrittling?
must they have been embrittling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not embrittle?
must you not embrittle?
must he not embrittle?
must we not embrittle?
must you not embrittle?
must they not embrittle? 	must I not be embrittling?
must you not be embrittling?
must he not be embrittling?
must we not be embrittling?
must you not be embrittling?
must they not be embrittling? 	must I not have embrittled?
must you not have embrittled?
must he not have embrittled?
must we not have embrittled?
must you not have embrittled?
must they not have embrittled? 	must I not have been embrittling?
must you not have been embrittling?
must he not have been embrittling?
must we not have been embrittling?
must you not have been embrittling?
must they not have been embrittling?