I could enclose you could enclose he could enclose we could enclose you could enclose they could enclose
V-ing form
I could be enclosing you could be enclosing he could be enclosing we could be enclosing you could be enclosing they could be enclosing
Perfect
I could have enclosed you could have enclosed he could have enclosed we could have enclosed you could have enclosed they could have enclosed
V-ing perfect
I could have been enclosing you could have been enclosing he could have been enclosing we could have been enclosing you could have been enclosing they could have been enclosing
Negation
Simple form
I couldn't enclose you couldn't enclose he couldn't enclose we couldn't enclose you couldn't enclose they couldn't enclose
V-ing form
I couldn't be enclosing you couldn't be enclosing he couldn't be enclosing we couldn't be enclosing you couldn't be enclosing they couldn't be enclosing
Perfect
I couldn't have enclosed you couldn't have enclosed he couldn't have enclosed we couldn't have enclosed you couldn't have enclosed they couldn't have enclosed
V-ing perfect
I couldn't have been enclosing you couldn't have been enclosing he couldn't have been enclosing we couldn't have been enclosing you couldn't have been enclosing they couldn't have been enclosing
Interrogative form
Simple form
could I enclose? could you enclose? could he enclose? could we enclose? could you enclose? could they enclose?
V-ing form
could I be enclosing? could you be enclosing? could he be enclosing? could we be enclosing? could you be enclosing? could they be enclosing?
Perfect
could I have enclosed? could you have enclosed? could he have enclosed? could we have enclosed? could you have enclosed? could they have enclosed?
V-ing perfect
could I have been enclosing? could you have been enclosing? could he have been enclosing? could we have been enclosing? could you have been enclosing? could they have been enclosing?
Interro-negative form
Simple form
couldn't I enclose? couldn't you enclose? couldn't he enclose? couldn't we enclose? couldn't you enclose? couldn't they enclose?
V-ing form
couldn't I be enclosing? couldn't you be enclosing? couldn't he be enclosing? couldn't we be enclosing? couldn't you be enclosing? couldn't they be enclosing?
Perfect
couldn't I have enclosed? couldn't you have enclosed? couldn't he have enclosed? couldn't we have enclosed? couldn't you have enclosed? couldn't they have enclosed?
V-ing perfect
couldn't I have been enclosing? couldn't you have been enclosing? couldn't he have been enclosing? couldn't we have been enclosing? couldn't you have been enclosing? couldn't they have been enclosing?