could survey
Regular verb: survey - surveyed- surveyed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not survey
you could not survey
he could not survey
we could not survey
you could not survey
they could not survey 	I could not be surveying
you could not be surveying
he could not be surveying
we could not be surveying
you could not be surveying
they could not be surveying	I could not have surveyed
you could not have surveyed
he could not have surveyed
we could not have surveyed
you could not have surveyed
they could not have surveyed	I could not have been surveying
you could not have been surveying
he could not have been surveying
we could not have been surveying
you could not have been surveying
they could not have been surveying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not survey?
could you not survey?
could he not survey?
could we not survey?
could you not survey?
could they not survey? 	could I not be surveying?
could you not be surveying?
could he not be surveying?
could we not be surveying?
could you not be surveying?
could they not be surveying? 	could I not have surveyed?
could you not have surveyed?
could he not have surveyed?
could we not have surveyed?
could you not have surveyed?
could they not have surveyed? 	could I not have been surveying?
could you not have been surveying?
could he not have been surveying?
could we not have been surveying?
could you not have been surveying?
could they not have been surveying?