could migrate
Regular verb: migrate - migrated- migrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could migrate
you could migrate
she could migrate
we could migrate
you could migrate
they could migrate 	I could be migrating
you could be migrating
she could be migrating
we could be migrating
you could be migrating
they could be migrating	I could have migrated
you could have migrated
she could have migrated
we could have migrated
you could have migrated
they could have migrated	I could have been migrating
you could have been migrating
she could have been migrating
we could have been migrating
you could have been migrating
they could have been migrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't migrate
you couldn't migrate
she couldn't migrate
we couldn't migrate
you couldn't migrate
they couldn't migrate 	I couldn't be migrating
you couldn't be migrating
she couldn't be migrating
we couldn't be migrating
you couldn't be migrating
they couldn't be migrating	I couldn't have migrated
you couldn't have migrated
she couldn't have migrated
we couldn't have migrated
you couldn't have migrated
they couldn't have migrated	I couldn't have been migrating
you couldn't have been migrating
she couldn't have been migrating
we couldn't have been migrating
you couldn't have been migrating
they couldn't have been migrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I migrate?
could you migrate?
could she migrate?
could we migrate?
could you migrate?
could they migrate? 	could I be migrating?
could you be migrating?
could she be migrating?
could we be migrating?
could you be migrating?
could they be migrating? 	could I have migrated?
could you have migrated?
could she have migrated?
could we have migrated?
could you have migrated?
could they have migrated? 	could I have been migrating?
could you have been migrating?
could she have been migrating?
could we have been migrating?
could you have been migrating?
could they have been migrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I migrate?
couldn't you migrate?
couldn't she migrate?
couldn't we migrate?
couldn't you migrate?
couldn't they migrate? 	couldn't I be migrating?
couldn't you be migrating?
couldn't she be migrating?
couldn't we be migrating?
couldn't you be migrating?
couldn't they be migrating? 	couldn't I have migrated?
couldn't you have migrated?
couldn't she have migrated?
couldn't we have migrated?
couldn't you have migrated?
couldn't they have migrated? 	couldn't I have been migrating?
couldn't you have been migrating?
couldn't she have been migrating?
couldn't we have been migrating?
couldn't you have been migrating?
couldn't they have been migrating?