could survey
Regular verb: survey - surveyed- surveyed

Affirmation 	
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I could survey
you could survey
he could survey
we could survey
you could survey
they could survey 	I could be surveying
you could be surveying
he could be surveying
we could be surveying
you could be surveying
they could be surveying	I could have surveyed
you could have surveyed
he could have surveyed
we could have surveyed
you could have surveyed
they could have surveyed	I could have been surveying
you could have been surveying
he could have been surveying
we could have been surveying
you could have been surveying
they could have been surveying	

Negation 	
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I couldn't survey
you couldn't survey
he couldn't survey
we couldn't survey
you couldn't survey
they couldn't survey 	I couldn't be surveying
you couldn't be surveying
he couldn't be surveying
we couldn't be surveying
you couldn't be surveying
they couldn't be surveying	I couldn't have surveyed
you couldn't have surveyed
he couldn't have surveyed
we couldn't have surveyed
you couldn't have surveyed
they couldn't have surveyed	I couldn't have been surveying
you couldn't have been surveying
he couldn't have been surveying
we couldn't have been surveying
you couldn't have been surveying
they couldn't have been surveying	

Interrogative form 	
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could I survey?
could you survey?
could he survey?
could we survey?
could you survey?
could they survey? 	could I be surveying?
could you be surveying?
could he be surveying?
could we be surveying?
could you be surveying?
could they be surveying? 	could I have surveyed?
could you have surveyed?
could he have surveyed?
could we have surveyed?
could you have surveyed?
could they have surveyed? 	could I have been surveying?
could you have been surveying?
could he have been surveying?
could we have been surveying?
could you have been surveying?
could they have been surveying? 	

Interro-negative form 	
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couldn't I survey?
couldn't you survey?
couldn't he survey?
couldn't we survey?
couldn't you survey?
couldn't they survey? 	couldn't I be surveying?
couldn't you be surveying?
couldn't he be surveying?
couldn't we be surveying?
couldn't you be surveying?
couldn't they be surveying? 	couldn't I have surveyed?
couldn't you have surveyed?
couldn't he have surveyed?
couldn't we have surveyed?
couldn't you have surveyed?
couldn't they have surveyed? 	couldn't I have been surveying?
couldn't you have been surveying?
couldn't he have been surveying?
couldn't we have been surveying?
couldn't you have been surveying?
couldn't they have been surveying?