could puzzle
Regular verb: puzzle - puzzled- puzzled

Affirmation 	
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I could puzzle
you could puzzle
she could puzzle
we could puzzle
you could puzzle
they could puzzle 	I could be puzzling
you could be puzzling
she could be puzzling
we could be puzzling
you could be puzzling
they could be puzzling	I could have puzzled
you could have puzzled
she could have puzzled
we could have puzzled
you could have puzzled
they could have puzzled	I could have been puzzling
you could have been puzzling
she could have been puzzling
we could have been puzzling
you could have been puzzling
they could have been puzzling	

Negation 	
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I couldn't puzzle
you couldn't puzzle
she couldn't puzzle
we couldn't puzzle
you couldn't puzzle
they couldn't puzzle 	I couldn't be puzzling
you couldn't be puzzling
she couldn't be puzzling
we couldn't be puzzling
you couldn't be puzzling
they couldn't be puzzling	I couldn't have puzzled
you couldn't have puzzled
she couldn't have puzzled
we couldn't have puzzled
you couldn't have puzzled
they couldn't have puzzled	I couldn't have been puzzling
you couldn't have been puzzling
she couldn't have been puzzling
we couldn't have been puzzling
you couldn't have been puzzling
they couldn't have been puzzling	

Interrogative form 	
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could I puzzle?
could you puzzle?
could she puzzle?
could we puzzle?
could you puzzle?
could they puzzle? 	could I be puzzling?
could you be puzzling?
could she be puzzling?
could we be puzzling?
could you be puzzling?
could they be puzzling? 	could I have puzzled?
could you have puzzled?
could she have puzzled?
could we have puzzled?
could you have puzzled?
could they have puzzled? 	could I have been puzzling?
could you have been puzzling?
could she have been puzzling?
could we have been puzzling?
could you have been puzzling?
could they have been puzzling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I puzzle?
couldn't you puzzle?
couldn't she puzzle?
couldn't we puzzle?
couldn't you puzzle?
couldn't they puzzle? 	couldn't I be puzzling?
couldn't you be puzzling?
couldn't she be puzzling?
couldn't we be puzzling?
couldn't you be puzzling?
couldn't they be puzzling? 	couldn't I have puzzled?
couldn't you have puzzled?
couldn't she have puzzled?
couldn't we have puzzled?
couldn't you have puzzled?
couldn't they have puzzled? 	couldn't I have been puzzling?
couldn't you have been puzzling?
couldn't she have been puzzling?
couldn't we have been puzzling?
couldn't you have been puzzling?
couldn't they have been puzzling?