could mail
Regular verb: mail - mailed- mailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mail
you could mail
he could mail
we could mail
you could mail
they could mail 	I could be mailing
you could be mailing
he could be mailing
we could be mailing
you could be mailing
they could be mailing	I could have mailed
you could have mailed
he could have mailed
we could have mailed
you could have mailed
they could have mailed	I could have been mailing
you could have been mailing
he could have been mailing
we could have been mailing
you could have been mailing
they could have been mailing	

Negation 	
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I couldn't mail
you couldn't mail
he couldn't mail
we couldn't mail
you couldn't mail
they couldn't mail 	I couldn't be mailing
you couldn't be mailing
he couldn't be mailing
we couldn't be mailing
you couldn't be mailing
they couldn't be mailing	I couldn't have mailed
you couldn't have mailed
he couldn't have mailed
we couldn't have mailed
you couldn't have mailed
they couldn't have mailed	I couldn't have been mailing
you couldn't have been mailing
he couldn't have been mailing
we couldn't have been mailing
you couldn't have been mailing
they couldn't have been mailing	

Interrogative form 	
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could I mail?
could you mail?
could he mail?
could we mail?
could you mail?
could they mail? 	could I be mailing?
could you be mailing?
could he be mailing?
could we be mailing?
could you be mailing?
could they be mailing? 	could I have mailed?
could you have mailed?
could he have mailed?
could we have mailed?
could you have mailed?
could they have mailed? 	could I have been mailing?
could you have been mailing?
could he have been mailing?
could we have been mailing?
could you have been mailing?
could they have been mailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I mail?
couldn't you mail?
couldn't he mail?
couldn't we mail?
couldn't you mail?
couldn't they mail? 	couldn't I be mailing?
couldn't you be mailing?
couldn't he be mailing?
couldn't we be mailing?
couldn't you be mailing?
couldn't they be mailing? 	couldn't I have mailed?
couldn't you have mailed?
couldn't he have mailed?
couldn't we have mailed?
couldn't you have mailed?
couldn't they have mailed? 	couldn't I have been mailing?
couldn't you have been mailing?
couldn't he have been mailing?
couldn't we have been mailing?
couldn't you have been mailing?
couldn't they have been mailing?