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

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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 could not instant-message
you could not instant-message
she could not instant-message
we could not instant-message
you could not instant-message
they could not instant-message 	I could not be instant-messaging
you could not be instant-messaging
she could not be instant-messaging
we could not be instant-messaging
you could not be instant-messaging
they could not be instant-messaging	I could not have instant-messaged
you could not have instant-messaged
she could not have instant-messaged
we could not have instant-messaged
you could not have instant-messaged
they could not have instant-messaged	I could not have been instant-messaging
you could not have been instant-messaging
she could not have been instant-messaging
we could not have been instant-messaging
you could not have been instant-messaging
they could not have been instant-messaging	

Interrogative form 	
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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 	
could I not instant-message?
could you not instant-message?
could she not instant-message?
could we not instant-message?
could you not instant-message?
could they not instant-message? 	could I not be instant-messaging?
could you not be instant-messaging?
could she not be instant-messaging?
could we not be instant-messaging?
could you not be instant-messaging?
could they not be instant-messaging? 	could I not have instant-messaged?
could you not have instant-messaged?
could she not have instant-messaged?
could we not have instant-messaged?
could you not have instant-messaged?
could they not have instant-messaged? 	could I not have been instant-messaging?
could you not have been instant-messaging?
could she not have been instant-messaging?
could we not have been instant-messaging?
could you not have been instant-messaging?
could they not have been instant-messaging?