could eavesdrop
Regular verb: eavesdrop - eavesdropped- eavesdropped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could eavesdrop
you could eavesdrop
she could eavesdrop
we could eavesdrop
you could eavesdrop
they could eavesdrop 	I could be eavesdropping
you could be eavesdropping
she could be eavesdropping
we could be eavesdropping
you could be eavesdropping
they could be eavesdropping	I could have eavesdropped
you could have eavesdropped
she could have eavesdropped
we could have eavesdropped
you could have eavesdropped
they could have eavesdropped	I could have been eavesdropping
you could have been eavesdropping
she could have been eavesdropping
we could have been eavesdropping
you could have been eavesdropping
they could have been eavesdropping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't eavesdrop
you couldn't eavesdrop
she couldn't eavesdrop
we couldn't eavesdrop
you couldn't eavesdrop
they couldn't eavesdrop 	I couldn't be eavesdropping
you couldn't be eavesdropping
she couldn't be eavesdropping
we couldn't be eavesdropping
you couldn't be eavesdropping
they couldn't be eavesdropping	I couldn't have eavesdropped
you couldn't have eavesdropped
she couldn't have eavesdropped
we couldn't have eavesdropped
you couldn't have eavesdropped
they couldn't have eavesdropped	I couldn't have been eavesdropping
you couldn't have been eavesdropping
she couldn't have been eavesdropping
we couldn't have been eavesdropping
you couldn't have been eavesdropping
they couldn't have been eavesdropping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I eavesdrop?
could you eavesdrop?
could she eavesdrop?
could we eavesdrop?
could you eavesdrop?
could they eavesdrop? 	could I be eavesdropping?
could you be eavesdropping?
could she be eavesdropping?
could we be eavesdropping?
could you be eavesdropping?
could they be eavesdropping? 	could I have eavesdropped?
could you have eavesdropped?
could she have eavesdropped?
could we have eavesdropped?
could you have eavesdropped?
could they have eavesdropped? 	could I have been eavesdropping?
could you have been eavesdropping?
could she have been eavesdropping?
could we have been eavesdropping?
could you have been eavesdropping?
could they have been eavesdropping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I eavesdrop?
couldn't you eavesdrop?
couldn't she eavesdrop?
couldn't we eavesdrop?
couldn't you eavesdrop?
couldn't they eavesdrop? 	couldn't I be eavesdropping?
couldn't you be eavesdropping?
couldn't she be eavesdropping?
couldn't we be eavesdropping?
couldn't you be eavesdropping?
couldn't they be eavesdropping? 	couldn't I have eavesdropped?
couldn't you have eavesdropped?
couldn't she have eavesdropped?
couldn't we have eavesdropped?
couldn't you have eavesdropped?
couldn't they have eavesdropped? 	couldn't I have been eavesdropping?
couldn't you have been eavesdropping?
couldn't she have been eavesdropping?
couldn't we have been eavesdropping?
couldn't you have been eavesdropping?
couldn't they have been eavesdropping?