could tong
Regular verb: tong - tonged- tonged

Affirmation 	
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I could tong
you could tong
he could tong
we could tong
you could tong
they could tong 	I could be tonging
you could be tonging
he could be tonging
we could be tonging
you could be tonging
they could be tonging	I could have tonged
you could have tonged
he could have tonged
we could have tonged
you could have tonged
they could have tonged	I could have been tonging
you could have been tonging
he could have been tonging
we could have been tonging
you could have been tonging
they could have been tonging	

Negation 	
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I couldn't tong
you couldn't tong
he couldn't tong
we couldn't tong
you couldn't tong
they couldn't tong 	I couldn't be tonging
you couldn't be tonging
he couldn't be tonging
we couldn't be tonging
you couldn't be tonging
they couldn't be tonging	I couldn't have tonged
you couldn't have tonged
he couldn't have tonged
we couldn't have tonged
you couldn't have tonged
they couldn't have tonged	I couldn't have been tonging
you couldn't have been tonging
he couldn't have been tonging
we couldn't have been tonging
you couldn't have been tonging
they couldn't have been tonging	

Interrogative form 	
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could I tong?
could you tong?
could he tong?
could we tong?
could you tong?
could they tong? 	could I be tonging?
could you be tonging?
could he be tonging?
could we be tonging?
could you be tonging?
could they be tonging? 	could I have tonged?
could you have tonged?
could he have tonged?
could we have tonged?
could you have tonged?
could they have tonged? 	could I have been tonging?
could you have been tonging?
could he have been tonging?
could we have been tonging?
could you have been tonging?
could they have been tonging? 	

Interro-negative form 	
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couldn't I tong?
couldn't you tong?
couldn't he tong?
couldn't we tong?
couldn't you tong?
couldn't they tong? 	couldn't I be tonging?
couldn't you be tonging?
couldn't he be tonging?
couldn't we be tonging?
couldn't you be tonging?
couldn't they be tonging? 	couldn't I have tonged?
couldn't you have tonged?
couldn't he have tonged?
couldn't we have tonged?
couldn't you have tonged?
couldn't they have tonged? 	couldn't I have been tonging?
couldn't you have been tonging?
couldn't he have been tonging?
couldn't we have been tonging?
couldn't you have been tonging?
couldn't they have been tonging?