could deduct
Regular verb: deduct - deducted- deducted

Affirmation 	
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I could deduct
you could deduct
he could deduct
we could deduct
you could deduct
they could deduct 	I could be deducting
you could be deducting
he could be deducting
we could be deducting
you could be deducting
they could be deducting	I could have deducted
you could have deducted
he could have deducted
we could have deducted
you could have deducted
they could have deducted	I could have been deducting
you could have been deducting
he could have been deducting
we could have been deducting
you could have been deducting
they could have been deducting	

Negation 	
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I couldn't deduct
you couldn't deduct
he couldn't deduct
we couldn't deduct
you couldn't deduct
they couldn't deduct 	I couldn't be deducting
you couldn't be deducting
he couldn't be deducting
we couldn't be deducting
you couldn't be deducting
they couldn't be deducting	I couldn't have deducted
you couldn't have deducted
he couldn't have deducted
we couldn't have deducted
you couldn't have deducted
they couldn't have deducted	I couldn't have been deducting
you couldn't have been deducting
he couldn't have been deducting
we couldn't have been deducting
you couldn't have been deducting
they couldn't have been deducting	

Interrogative form 	
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could I deduct?
could you deduct?
could he deduct?
could we deduct?
could you deduct?
could they deduct? 	could I be deducting?
could you be deducting?
could he be deducting?
could we be deducting?
could you be deducting?
could they be deducting? 	could I have deducted?
could you have deducted?
could he have deducted?
could we have deducted?
could you have deducted?
could they have deducted? 	could I have been deducting?
could you have been deducting?
could he have been deducting?
could we have been deducting?
could you have been deducting?
could they have been deducting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I deduct?
couldn't you deduct?
couldn't he deduct?
couldn't we deduct?
couldn't you deduct?
couldn't they deduct? 	couldn't I be deducting?
couldn't you be deducting?
couldn't he be deducting?
couldn't we be deducting?
couldn't you be deducting?
couldn't they be deducting? 	couldn't I have deducted?
couldn't you have deducted?
couldn't he have deducted?
couldn't we have deducted?
couldn't you have deducted?
couldn't they have deducted? 	couldn't I have been deducting?
couldn't you have been deducting?
couldn't he have been deducting?
couldn't we have been deducting?
couldn't you have been deducting?
couldn't they have been deducting?