may predecease
Regular verb: predecease - predeceased- predeceased

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

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

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I predecease?
mayn't you predecease?
mayn't he predecease?
mayn't we predecease?
mayn't you predecease?
mayn't they predecease? 	mayn't I be predeceasing?
mayn't you be predeceasing?
mayn't he be predeceasing?
mayn't we be predeceasing?
mayn't you be predeceasing?
mayn't they be predeceasing? 	mayn't I have predeceased?
mayn't you have predeceased?
mayn't he have predeceased?
mayn't we have predeceased?
mayn't you have predeceased?
mayn't they have predeceased? 	mayn't I have been predeceasing?
mayn't you have been predeceasing?
mayn't he have been predeceasing?
mayn't we have been predeceasing?
mayn't you have been predeceasing?
mayn't they have been predeceasing?