could leak
Regular verb: leak - leaked- leaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could leak
you could leak
he could leak
we could leak
you could leak
they could leak 	I could be leaking
you could be leaking
he could be leaking
we could be leaking
you could be leaking
they could be leaking	I could have leaked
you could have leaked
he could have leaked
we could have leaked
you could have leaked
they could have leaked	I could have been leaking
you could have been leaking
he could have been leaking
we could have been leaking
you could have been leaking
they could have been leaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't leak
you couldn't leak
he couldn't leak
we couldn't leak
you couldn't leak
they couldn't leak 	I couldn't be leaking
you couldn't be leaking
he couldn't be leaking
we couldn't be leaking
you couldn't be leaking
they couldn't be leaking	I couldn't have leaked
you couldn't have leaked
he couldn't have leaked
we couldn't have leaked
you couldn't have leaked
they couldn't have leaked	I couldn't have been leaking
you couldn't have been leaking
he couldn't have been leaking
we couldn't have been leaking
you couldn't have been leaking
they couldn't have been leaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I leak?
could you leak?
could he leak?
could we leak?
could you leak?
could they leak? 	could I be leaking?
could you be leaking?
could he be leaking?
could we be leaking?
could you be leaking?
could they be leaking? 	could I have leaked?
could you have leaked?
could he have leaked?
could we have leaked?
could you have leaked?
could they have leaked? 	could I have been leaking?
could you have been leaking?
could he have been leaking?
could we have been leaking?
could you have been leaking?
could they have been leaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I leak?
couldn't you leak?
couldn't he leak?
couldn't we leak?
couldn't you leak?
couldn't they leak? 	couldn't I be leaking?
couldn't you be leaking?
couldn't he be leaking?
couldn't we be leaking?
couldn't you be leaking?
couldn't they be leaking? 	couldn't I have leaked?
couldn't you have leaked?
couldn't he have leaked?
couldn't we have leaked?
couldn't you have leaked?
couldn't they have leaked? 	couldn't I have been leaking?
couldn't you have been leaking?
couldn't he have been leaking?
couldn't we have been leaking?
couldn't you have been leaking?
couldn't they have been leaking?