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