could perish
Regular verb: perish - perished- perished

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could perish
you could perish
he could perish
we could perish
you could perish
they could perish 	I could be perishing
you could be perishing
he could be perishing
we could be perishing
you could be perishing
they could be perishing	I could have perished
you could have perished
he could have perished
we could have perished
you could have perished
they could have perished	I could have been perishing
you could have been perishing
he could have been perishing
we could have been perishing
you could have been perishing
they could have been perishing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't perish
you couldn't perish
he couldn't perish
we couldn't perish
you couldn't perish
they couldn't perish 	I couldn't be perishing
you couldn't be perishing
he couldn't be perishing
we couldn't be perishing
you couldn't be perishing
they couldn't be perishing	I couldn't have perished
you couldn't have perished
he couldn't have perished
we couldn't have perished
you couldn't have perished
they couldn't have perished	I couldn't have been perishing
you couldn't have been perishing
he couldn't have been perishing
we couldn't have been perishing
you couldn't have been perishing
they couldn't have been perishing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I perish?
could you perish?
could he perish?
could we perish?
could you perish?
could they perish? 	could I be perishing?
could you be perishing?
could he be perishing?
could we be perishing?
could you be perishing?
could they be perishing? 	could I have perished?
could you have perished?
could he have perished?
could we have perished?
could you have perished?
could they have perished? 	could I have been perishing?
could you have been perishing?
could he have been perishing?
could we have been perishing?
could you have been perishing?
could they have been perishing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I perish?
couldn't you perish?
couldn't he perish?
couldn't we perish?
couldn't you perish?
couldn't they perish? 	couldn't I be perishing?
couldn't you be perishing?
couldn't he be perishing?
couldn't we be perishing?
couldn't you be perishing?
couldn't they be perishing? 	couldn't I have perished?
couldn't you have perished?
couldn't he have perished?
couldn't we have perished?
couldn't you have perished?
couldn't they have perished? 	couldn't I have been perishing?
couldn't you have been perishing?
couldn't he have been perishing?
couldn't we have been perishing?
couldn't you have been perishing?
couldn't they have been perishing?