could predecease
Regular verb: predecease - predeceased- predeceased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could predecease
you could predecease
she could predecease
we could predecease
you could predecease
they could predecease 	I could be predeceasing
you could be predeceasing
she could be predeceasing
we could be predeceasing
you could be predeceasing
they could be predeceasing	I could have predeceased
you could have predeceased
she could have predeceased
we could have predeceased
you could have predeceased
they could have predeceased	I could have been predeceasing
you could have been predeceasing
she could have been predeceasing
we could have been predeceasing
you could have been predeceasing
they could have been predeceasing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not predecease
you could not predecease
she could not predecease
we could not predecease
you could not predecease
they could not predecease 	I could not be predeceasing
you could not be predeceasing
she could not be predeceasing
we could not be predeceasing
you could not be predeceasing
they could not be predeceasing	I could not have predeceased
you could not have predeceased
she could not have predeceased
we could not have predeceased
you could not have predeceased
they could not have predeceased	I could not have been predeceasing
you could not have been predeceasing
she could not have been predeceasing
we could not have been predeceasing
you could not have been predeceasing
they could not have been predeceasing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I predecease?
could you predecease?
could she predecease?
could we predecease?
could you predecease?
could they predecease? 	could I be predeceasing?
could you be predeceasing?
could she be predeceasing?
could we be predeceasing?
could you be predeceasing?
could they be predeceasing? 	could I have predeceased?
could you have predeceased?
could she have predeceased?
could we have predeceased?
could you have predeceased?
could they have predeceased? 	could I have been predeceasing?
could you have been predeceasing?
could she have been predeceasing?
could we have been predeceasing?
could you have been predeceasing?
could they have been predeceasing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not predecease?
could you not predecease?
could she not predecease?
could we not predecease?
could you not predecease?
could they not predecease? 	could I not be predeceasing?
could you not be predeceasing?
could she not be predeceasing?
could we not be predeceasing?
could you not be predeceasing?
could they not be predeceasing? 	could I not have predeceased?
could you not have predeceased?
could she not have predeceased?
could we not have predeceased?
could you not have predeceased?
could they not have predeceased? 	could I not have been predeceasing?
could you not have been predeceasing?
could she not have been predeceasing?
could we not have been predeceasing?
could you not have been predeceasing?
could they not have been predeceasing?