could arrive
Regular verb: arrive - arrived- arrived

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could arrive
you could arrive
he could arrive
we could arrive
you could arrive
they could arrive 	I could be arriving
you could be arriving
he could be arriving
we could be arriving
you could be arriving
they could be arriving	I could have arrived
you could have arrived
he could have arrived
we could have arrived
you could have arrived
they could have arrived	I could have been arriving
you could have been arriving
he could have been arriving
we could have been arriving
you could have been arriving
they could have been arriving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't arrive
you couldn't arrive
he couldn't arrive
we couldn't arrive
you couldn't arrive
they couldn't arrive 	I couldn't be arriving
you couldn't be arriving
he couldn't be arriving
we couldn't be arriving
you couldn't be arriving
they couldn't be arriving	I couldn't have arrived
you couldn't have arrived
he couldn't have arrived
we couldn't have arrived
you couldn't have arrived
they couldn't have arrived	I couldn't have been arriving
you couldn't have been arriving
he couldn't have been arriving
we couldn't have been arriving
you couldn't have been arriving
they couldn't have been arriving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I arrive?
could you arrive?
could he arrive?
could we arrive?
could you arrive?
could they arrive? 	could I be arriving?
could you be arriving?
could he be arriving?
could we be arriving?
could you be arriving?
could they be arriving? 	could I have arrived?
could you have arrived?
could he have arrived?
could we have arrived?
could you have arrived?
could they have arrived? 	could I have been arriving?
could you have been arriving?
could he have been arriving?
could we have been arriving?
could you have been arriving?
could they have been arriving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I arrive?
couldn't you arrive?
couldn't he arrive?
couldn't we arrive?
couldn't you arrive?
couldn't they arrive? 	couldn't I be arriving?
couldn't you be arriving?
couldn't he be arriving?
couldn't we be arriving?
couldn't you be arriving?
couldn't they be arriving? 	couldn't I have arrived?
couldn't you have arrived?
couldn't he have arrived?
couldn't we have arrived?
couldn't you have arrived?
couldn't they have arrived? 	couldn't I have been arriving?
couldn't you have been arriving?
couldn't he have been arriving?
couldn't we have been arriving?
couldn't you have been arriving?
couldn't they have been arriving?