could embrittle
Regular verb: embrittle - embrittled- embrittled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could embrittle
you could embrittle
she could embrittle
we could embrittle
you could embrittle
they could embrittle 	I could be embrittling
you could be embrittling
she could be embrittling
we could be embrittling
you could be embrittling
they could be embrittling	I could have embrittled
you could have embrittled
she could have embrittled
we could have embrittled
you could have embrittled
they could have embrittled	I could have been embrittling
you could have been embrittling
she could have been embrittling
we could have been embrittling
you could have been embrittling
they could have been embrittling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not embrittle
you could not embrittle
she could not embrittle
we could not embrittle
you could not embrittle
they could not embrittle 	I could not be embrittling
you could not be embrittling
she could not be embrittling
we could not be embrittling
you could not be embrittling
they could not be embrittling	I could not have embrittled
you could not have embrittled
she could not have embrittled
we could not have embrittled
you could not have embrittled
they could not have embrittled	I could not have been embrittling
you could not have been embrittling
she could not have been embrittling
we could not have been embrittling
you could not have been embrittling
they could not have been embrittling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I embrittle?
could you embrittle?
could she embrittle?
could we embrittle?
could you embrittle?
could they embrittle? 	could I be embrittling?
could you be embrittling?
could she be embrittling?
could we be embrittling?
could you be embrittling?
could they be embrittling? 	could I have embrittled?
could you have embrittled?
could she have embrittled?
could we have embrittled?
could you have embrittled?
could they have embrittled? 	could I have been embrittling?
could you have been embrittling?
could she have been embrittling?
could we have been embrittling?
could you have been embrittling?
could they have been embrittling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not embrittle?
could you not embrittle?
could she not embrittle?
could we not embrittle?
could you not embrittle?
could they not embrittle? 	could I not be embrittling?
could you not be embrittling?
could she not be embrittling?
could we not be embrittling?
could you not be embrittling?
could they not be embrittling? 	could I not have embrittled?
could you not have embrittled?
could she not have embrittled?
could we not have embrittled?
could you not have embrittled?
could they not have embrittled? 	could I not have been embrittling?
could you not have been embrittling?
could she not have been embrittling?
could we not have been embrittling?
could you not have been embrittling?
could they not have been embrittling?