could perspire
Regular verb: perspire - perspired- perspired

Affirmation 	
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I could perspire
you could perspire
he could perspire
we could perspire
you could perspire
they could perspire 	I could be perspiring
you could be perspiring
he could be perspiring
we could be perspiring
you could be perspiring
they could be perspiring	I could have perspired
you could have perspired
he could have perspired
we could have perspired
you could have perspired
they could have perspired	I could have been perspiring
you could have been perspiring
he could have been perspiring
we could have been perspiring
you could have been perspiring
they could have been perspiring	

Negation 	
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I could not perspire
you could not perspire
he could not perspire
we could not perspire
you could not perspire
they could not perspire 	I could not be perspiring
you could not be perspiring
he could not be perspiring
we could not be perspiring
you could not be perspiring
they could not be perspiring	I could not have perspired
you could not have perspired
he could not have perspired
we could not have perspired
you could not have perspired
they could not have perspired	I could not have been perspiring
you could not have been perspiring
he could not have been perspiring
we could not have been perspiring
you could not have been perspiring
they could not have been perspiring	

Interrogative form 	
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could I perspire?
could you perspire?
could he perspire?
could we perspire?
could you perspire?
could they perspire? 	could I be perspiring?
could you be perspiring?
could he be perspiring?
could we be perspiring?
could you be perspiring?
could they be perspiring? 	could I have perspired?
could you have perspired?
could he have perspired?
could we have perspired?
could you have perspired?
could they have perspired? 	could I have been perspiring?
could you have been perspiring?
could he have been perspiring?
could we have been perspiring?
could you have been perspiring?
could they have been perspiring? 	

Interro-negative form 	
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could I not perspire?
could you not perspire?
could he not perspire?
could we not perspire?
could you not perspire?
could they not perspire? 	could I not be perspiring?
could you not be perspiring?
could he not be perspiring?
could we not be perspiring?
could you not be perspiring?
could they not be perspiring? 	could I not have perspired?
could you not have perspired?
could he not have perspired?
could we not have perspired?
could you not have perspired?
could they not have perspired? 	could I not have been perspiring?
could you not have been perspiring?
could he not have been perspiring?
could we not have been perspiring?
could you not have been perspiring?
could they not have been perspiring?