could instant-message
Regular verb: instant-message - instant-messaged- instant-messaged

Affirmation 	
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I could instant-message
you could instant-message
she could instant-message
we could instant-message
you could instant-message
they could instant-message 	I could be instant-messaging
you could be instant-messaging
she could be instant-messaging
we could be instant-messaging
you could be instant-messaging
they could be instant-messaging	I could have instant-messaged
you could have instant-messaged
she could have instant-messaged
we could have instant-messaged
you could have instant-messaged
they could have instant-messaged	I could have been instant-messaging
you could have been instant-messaging
she could have been instant-messaging
we could have been instant-messaging
you could have been instant-messaging
they could have been instant-messaging	

Negation 	
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I couldn't instant-message
you couldn't instant-message
she couldn't instant-message
we couldn't instant-message
you couldn't instant-message
they couldn't instant-message 	I couldn't be instant-messaging
you couldn't be instant-messaging
she couldn't be instant-messaging
we couldn't be instant-messaging
you couldn't be instant-messaging
they couldn't be instant-messaging	I couldn't have instant-messaged
you couldn't have instant-messaged
she couldn't have instant-messaged
we couldn't have instant-messaged
you couldn't have instant-messaged
they couldn't have instant-messaged	I couldn't have been instant-messaging
you couldn't have been instant-messaging
she couldn't have been instant-messaging
we couldn't have been instant-messaging
you couldn't have been instant-messaging
they couldn't have been instant-messaging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I instant-message?
could you instant-message?
could she instant-message?
could we instant-message?
could you instant-message?
could they instant-message? 	could I be instant-messaging?
could you be instant-messaging?
could she be instant-messaging?
could we be instant-messaging?
could you be instant-messaging?
could they be instant-messaging? 	could I have instant-messaged?
could you have instant-messaged?
could she have instant-messaged?
could we have instant-messaged?
could you have instant-messaged?
could they have instant-messaged? 	could I have been instant-messaging?
could you have been instant-messaging?
could she have been instant-messaging?
could we have been instant-messaging?
could you have been instant-messaging?
could they have been instant-messaging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I instant-message?
couldn't you instant-message?
couldn't she instant-message?
couldn't we instant-message?
couldn't you instant-message?
couldn't they instant-message? 	couldn't I be instant-messaging?
couldn't you be instant-messaging?
couldn't she be instant-messaging?
couldn't we be instant-messaging?
couldn't you be instant-messaging?
couldn't they be instant-messaging? 	couldn't I have instant-messaged?
couldn't you have instant-messaged?
couldn't she have instant-messaged?
couldn't we have instant-messaged?
couldn't you have instant-messaged?
couldn't they have instant-messaged? 	couldn't I have been instant-messaging?
couldn't you have been instant-messaging?
couldn't she have been instant-messaging?
couldn't we have been instant-messaging?
couldn't you have been instant-messaging?
couldn't they have been instant-messaging?