could earn
Regular verb: earn - earned- earned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could earn
you could earn
she could earn
we could earn
you could earn
they could earn 	I could be earning
you could be earning
she could be earning
we could be earning
you could be earning
they could be earning	I could have earned
you could have earned
she could have earned
we could have earned
you could have earned
they could have earned	I could have been earning
you could have been earning
she could have been earning
we could have been earning
you could have been earning
they could have been earning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't earn
you couldn't earn
she couldn't earn
we couldn't earn
you couldn't earn
they couldn't earn 	I couldn't be earning
you couldn't be earning
she couldn't be earning
we couldn't be earning
you couldn't be earning
they couldn't be earning	I couldn't have earned
you couldn't have earned
she couldn't have earned
we couldn't have earned
you couldn't have earned
they couldn't have earned	I couldn't have been earning
you couldn't have been earning
she couldn't have been earning
we couldn't have been earning
you couldn't have been earning
they couldn't have been earning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I earn?
could you earn?
could she earn?
could we earn?
could you earn?
could they earn? 	could I be earning?
could you be earning?
could she be earning?
could we be earning?
could you be earning?
could they be earning? 	could I have earned?
could you have earned?
could she have earned?
could we have earned?
could you have earned?
could they have earned? 	could I have been earning?
could you have been earning?
could she have been earning?
could we have been earning?
could you have been earning?
could they have been earning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I earn?
couldn't you earn?
couldn't she earn?
couldn't we earn?
couldn't you earn?
couldn't they earn? 	couldn't I be earning?
couldn't you be earning?
couldn't she be earning?
couldn't we be earning?
couldn't you be earning?
couldn't they be earning? 	couldn't I have earned?
couldn't you have earned?
couldn't she have earned?
couldn't we have earned?
couldn't you have earned?
couldn't they have earned? 	couldn't I have been earning?
couldn't you have been earning?
couldn't she have been earning?
couldn't we have been earning?
couldn't you have been earning?
couldn't they have been earning?