I could strap you could strap she could strap we could strap you could strap they could strap
V-ing form
I could be strapping you could be strapping she could be strapping we could be strapping you could be strapping they could be strapping
Perfect
I could have strapped you could have strapped she could have strapped we could have strapped you could have strapped they could have strapped
V-ing perfect
I could have been strapping you could have been strapping she could have been strapping we could have been strapping you could have been strapping they could have been strapping
Negation
Simple form
I couldn't strap you couldn't strap she couldn't strap we couldn't strap you couldn't strap they couldn't strap
V-ing form
I couldn't be strapping you couldn't be strapping she couldn't be strapping we couldn't be strapping you couldn't be strapping they couldn't be strapping
Perfect
I couldn't have strapped you couldn't have strapped she couldn't have strapped we couldn't have strapped you couldn't have strapped they couldn't have strapped
V-ing perfect
I couldn't have been strapping you couldn't have been strapping she couldn't have been strapping we couldn't have been strapping you couldn't have been strapping they couldn't have been strapping
Interrogative form
Simple form
could I strap? could you strap? could she strap? could we strap? could you strap? could they strap?
V-ing form
could I be strapping? could you be strapping? could she be strapping? could we be strapping? could you be strapping? could they be strapping?
Perfect
could I have strapped? could you have strapped? could she have strapped? could we have strapped? could you have strapped? could they have strapped?
V-ing perfect
could I have been strapping? could you have been strapping? could she have been strapping? could we have been strapping? could you have been strapping? could they have been strapping?
Interro-negative form
Simple form
couldn't I strap? couldn't you strap? couldn't she strap? couldn't we strap? couldn't you strap? couldn't they strap?
V-ing form
couldn't I be strapping? couldn't you be strapping? couldn't she be strapping? couldn't we be strapping? couldn't you be strapping? couldn't they be strapping?
Perfect
couldn't I have strapped? couldn't you have strapped? couldn't she have strapped? couldn't we have strapped? couldn't you have strapped? couldn't they have strapped?
V-ing perfect
couldn't I have been strapping? couldn't you have been strapping? couldn't she have been strapping? couldn't we have been strapping? couldn't you have been strapping? couldn't they have been strapping?