could predecease
Regular verb: predecease - predeceased- predeceased

Affirmation 	
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I could predecease
you could predecease
he could predecease
we could predecease
you could predecease
they could predecease 	I could be predeceasing
you could be predeceasing
he could be predeceasing
we could be predeceasing
you could be predeceasing
they could be predeceasing	I could have predeceased
you could have predeceased
he 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
he could have been predeceasing
we could have been predeceasing
you could have been predeceasing
they could have been predeceasing	

Negation 	
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I couldn't predecease
you couldn't predecease
he couldn't predecease
we couldn't predecease
you couldn't predecease
they couldn't predecease 	I couldn't be predeceasing
you couldn't be predeceasing
he couldn't be predeceasing
we couldn't be predeceasing
you couldn't be predeceasing
they couldn't be predeceasing	I couldn't have predeceased
you couldn't have predeceased
he couldn't have predeceased
we couldn't have predeceased
you couldn't have predeceased
they couldn't have predeceased	I couldn't have been predeceasing
you couldn't have been predeceasing
he couldn't have been predeceasing
we couldn't have been predeceasing
you couldn't have been predeceasing
they couldn't have been predeceasing	

Interrogative form 	
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could I predecease?
could you predecease?
could he predecease?
could we predecease?
could you predecease?
could they predecease? 	could I be predeceasing?
could you be predeceasing?
could he be predeceasing?
could we be predeceasing?
could you be predeceasing?
could they be predeceasing? 	could I have predeceased?
could you have predeceased?
could he 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 he have been predeceasing?
could we have been predeceasing?
could you have been predeceasing?
could they have been predeceasing? 	

Interro-negative form 	
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couldn't I predecease?
couldn't you predecease?
couldn't he predecease?
couldn't we predecease?
couldn't you predecease?
couldn't they predecease? 	couldn't I be predeceasing?
couldn't you be predeceasing?
couldn't he be predeceasing?
couldn't we be predeceasing?
couldn't you be predeceasing?
couldn't they be predeceasing? 	couldn't I have predeceased?
couldn't you have predeceased?
couldn't he have predeceased?
couldn't we have predeceased?
couldn't you have predeceased?
couldn't they have predeceased? 	couldn't I have been predeceasing?
couldn't you have been predeceasing?
couldn't he have been predeceasing?
couldn't we have been predeceasing?
couldn't you have been predeceasing?
couldn't they have been predeceasing?