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