could waggle
Regular verb: waggle - waggled- waggled

Affirmation 	
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I could waggle
you could waggle
he could waggle
we could waggle
you could waggle
they could waggle 	I could be waggling
you could be waggling
he could be waggling
we could be waggling
you could be waggling
they could be waggling	I could have waggled
you could have waggled
he could have waggled
we could have waggled
you could have waggled
they could have waggled	I could have been waggling
you could have been waggling
he could have been waggling
we could have been waggling
you could have been waggling
they could have been waggling	

Negation 	
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I could not waggle
you could not waggle
he could not waggle
we could not waggle
you could not waggle
they could not waggle 	I could not be waggling
you could not be waggling
he could not be waggling
we could not be waggling
you could not be waggling
they could not be waggling	I could not have waggled
you could not have waggled
he could not have waggled
we could not have waggled
you could not have waggled
they could not have waggled	I could not have been waggling
you could not have been waggling
he could not have been waggling
we could not have been waggling
you could not have been waggling
they could not have been waggling	

Interrogative form 	
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could I waggle?
could you waggle?
could he waggle?
could we waggle?
could you waggle?
could they waggle? 	could I be waggling?
could you be waggling?
could he be waggling?
could we be waggling?
could you be waggling?
could they be waggling? 	could I have waggled?
could you have waggled?
could he have waggled?
could we have waggled?
could you have waggled?
could they have waggled? 	could I have been waggling?
could you have been waggling?
could he have been waggling?
could we have been waggling?
could you have been waggling?
could they have been waggling? 	

Interro-negative form 	
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could I not waggle?
could you not waggle?
could he not waggle?
could we not waggle?
could you not waggle?
could they not waggle? 	could I not be waggling?
could you not be waggling?
could he not be waggling?
could we not be waggling?
could you not be waggling?
could they not be waggling? 	could I not have waggled?
could you not have waggled?
could he not have waggled?
could we not have waggled?
could you not have waggled?
could they not have waggled? 	could I not have been waggling?
could you not have been waggling?
could he not have been waggling?
could we not have been waggling?
could you not have been waggling?
could they not have been waggling?