could dovetail
Regular verb: dovetail - dovetailed- dovetailed

Affirmation 	
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I could dovetail
you could dovetail
he could dovetail
we could dovetail
you could dovetail
they could dovetail 	I could be dovetailing
you could be dovetailing
he could be dovetailing
we could be dovetailing
you could be dovetailing
they could be dovetailing	I could have dovetailed
you could have dovetailed
he could have dovetailed
we could have dovetailed
you could have dovetailed
they could have dovetailed	I could have been dovetailing
you could have been dovetailing
he could have been dovetailing
we could have been dovetailing
you could have been dovetailing
they could have been dovetailing	

Negation 	
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I couldn't dovetail
you couldn't dovetail
he couldn't dovetail
we couldn't dovetail
you couldn't dovetail
they couldn't dovetail 	I couldn't be dovetailing
you couldn't be dovetailing
he couldn't be dovetailing
we couldn't be dovetailing
you couldn't be dovetailing
they couldn't be dovetailing	I couldn't have dovetailed
you couldn't have dovetailed
he couldn't have dovetailed
we couldn't have dovetailed
you couldn't have dovetailed
they couldn't have dovetailed	I couldn't have been dovetailing
you couldn't have been dovetailing
he couldn't have been dovetailing
we couldn't have been dovetailing
you couldn't have been dovetailing
they couldn't have been dovetailing	

Interrogative form 	
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could I dovetail?
could you dovetail?
could he dovetail?
could we dovetail?
could you dovetail?
could they dovetail? 	could I be dovetailing?
could you be dovetailing?
could he be dovetailing?
could we be dovetailing?
could you be dovetailing?
could they be dovetailing? 	could I have dovetailed?
could you have dovetailed?
could he have dovetailed?
could we have dovetailed?
could you have dovetailed?
could they have dovetailed? 	could I have been dovetailing?
could you have been dovetailing?
could he have been dovetailing?
could we have been dovetailing?
could you have been dovetailing?
could they have been dovetailing? 	

Interro-negative form 	
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couldn't I dovetail?
couldn't you dovetail?
couldn't he dovetail?
couldn't we dovetail?
couldn't you dovetail?
couldn't they dovetail? 	couldn't I be dovetailing?
couldn't you be dovetailing?
couldn't he be dovetailing?
couldn't we be dovetailing?
couldn't you be dovetailing?
couldn't they be dovetailing? 	couldn't I have dovetailed?
couldn't you have dovetailed?
couldn't he have dovetailed?
couldn't we have dovetailed?
couldn't you have dovetailed?
couldn't they have dovetailed? 	couldn't I have been dovetailing?
couldn't you have been dovetailing?
couldn't he have been dovetailing?
couldn't we have been dovetailing?
couldn't you have been dovetailing?
couldn't they have been dovetailing?