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