could quail
Regular verb: quail - quailed- quailed

Affirmation 	
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I could quail
you could quail
he could quail
we could quail
you could quail
they could quail 	I could be quailing
you could be quailing
he could be quailing
we could be quailing
you could be quailing
they could be quailing	I could have quailed
you could have quailed
he could have quailed
we could have quailed
you could have quailed
they could have quailed	I could have been quailing
you could have been quailing
he could have been quailing
we could have been quailing
you could have been quailing
they could have been quailing	

Negation 	
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I could not quail
you could not quail
he could not quail
we could not quail
you could not quail
they could not quail 	I could not be quailing
you could not be quailing
he could not be quailing
we could not be quailing
you could not be quailing
they could not be quailing	I could not have quailed
you could not have quailed
he could not have quailed
we could not have quailed
you could not have quailed
they could not have quailed	I could not have been quailing
you could not have been quailing
he could not have been quailing
we could not have been quailing
you could not have been quailing
they could not have been quailing	

Interrogative form 	
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could I quail?
could you quail?
could he quail?
could we quail?
could you quail?
could they quail? 	could I be quailing?
could you be quailing?
could he be quailing?
could we be quailing?
could you be quailing?
could they be quailing? 	could I have quailed?
could you have quailed?
could he have quailed?
could we have quailed?
could you have quailed?
could they have quailed? 	could I have been quailing?
could you have been quailing?
could he have been quailing?
could we have been quailing?
could you have been quailing?
could they have been quailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not quail?
could you not quail?
could he not quail?
could we not quail?
could you not quail?
could they not quail? 	could I not be quailing?
could you not be quailing?
could he not be quailing?
could we not be quailing?
could you not be quailing?
could they not be quailing? 	could I not have quailed?
could you not have quailed?
could he not have quailed?
could we not have quailed?
could you not have quailed?
could they not have quailed? 	could I not have been quailing?
could you not have been quailing?
could he not have been quailing?
could we not have been quailing?
could you not have been quailing?
could they not have been quailing?