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 couldn't waggle
you couldn't waggle
he couldn't waggle
we couldn't waggle
you couldn't waggle
they couldn't waggle 	I couldn't be waggling
you couldn't be waggling
he couldn't be waggling
we couldn't be waggling
you couldn't be waggling
they couldn't be waggling	I couldn't have waggled
you couldn't have waggled
he couldn't have waggled
we couldn't have waggled
you couldn't have waggled
they couldn't have waggled	I couldn't have been waggling
you couldn't have been waggling
he couldn't have been waggling
we couldn't have been waggling
you couldn't have been waggling
they couldn't 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 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I waggle?
couldn't you waggle?
couldn't he waggle?
couldn't we waggle?
couldn't you waggle?
couldn't they waggle? 	couldn't I be waggling?
couldn't you be waggling?
couldn't he be waggling?
couldn't we be waggling?
couldn't you be waggling?
couldn't they be waggling? 	couldn't I have waggled?
couldn't you have waggled?
couldn't he have waggled?
couldn't we have waggled?
couldn't you have waggled?
couldn't they have waggled? 	couldn't I have been waggling?
couldn't you have been waggling?
couldn't he have been waggling?
couldn't we have been waggling?
couldn't you have been waggling?
couldn't they have been waggling?