could luck
Regular verb: luck - lucked- lucked

Affirmation 	
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I could luck
you could luck
he could luck
we could luck
you could luck
they could luck 	I could be lucking
you could be lucking
he could be lucking
we could be lucking
you could be lucking
they could be lucking	I could have lucked
you could have lucked
he could have lucked
we could have lucked
you could have lucked
they could have lucked	I could have been lucking
you could have been lucking
he could have been lucking
we could have been lucking
you could have been lucking
they could have been lucking	

Negation 	
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I couldn't luck
you couldn't luck
he couldn't luck
we couldn't luck
you couldn't luck
they couldn't luck 	I couldn't be lucking
you couldn't be lucking
he couldn't be lucking
we couldn't be lucking
you couldn't be lucking
they couldn't be lucking	I couldn't have lucked
you couldn't have lucked
he couldn't have lucked
we couldn't have lucked
you couldn't have lucked
they couldn't have lucked	I couldn't have been lucking
you couldn't have been lucking
he couldn't have been lucking
we couldn't have been lucking
you couldn't have been lucking
they couldn't have been lucking	

Interrogative form 	
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could I luck?
could you luck?
could he luck?
could we luck?
could you luck?
could they luck? 	could I be lucking?
could you be lucking?
could he be lucking?
could we be lucking?
could you be lucking?
could they be lucking? 	could I have lucked?
could you have lucked?
could he have lucked?
could we have lucked?
could you have lucked?
could they have lucked? 	could I have been lucking?
could you have been lucking?
could he have been lucking?
could we have been lucking?
could you have been lucking?
could they have been lucking? 	

Interro-negative form 	
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couldn't I luck?
couldn't you luck?
couldn't he luck?
couldn't we luck?
couldn't you luck?
couldn't they luck? 	couldn't I be lucking?
couldn't you be lucking?
couldn't he be lucking?
couldn't we be lucking?
couldn't you be lucking?
couldn't they be lucking? 	couldn't I have lucked?
couldn't you have lucked?
couldn't he have lucked?
couldn't we have lucked?
couldn't you have lucked?
couldn't they have lucked? 	couldn't I have been lucking?
couldn't you have been lucking?
couldn't he have been lucking?
couldn't we have been lucking?
couldn't you have been lucking?
couldn't they have been lucking?