I could straddle you could straddle she could straddle we could straddle you could straddle they could straddle
V-ing form
I could be straddling you could be straddling she could be straddling we could be straddling you could be straddling they could be straddling
Perfect
I could have straddled you could have straddled she could have straddled we could have straddled you could have straddled they could have straddled
V-ing perfect
I could have been straddling you could have been straddling she could have been straddling we could have been straddling you could have been straddling they could have been straddling
Negation
Simple form
I could not straddle you could not straddle she could not straddle we could not straddle you could not straddle they could not straddle
V-ing form
I could not be straddling you could not be straddling she could not be straddling we could not be straddling you could not be straddling they could not be straddling
Perfect
I could not have straddled you could not have straddled she could not have straddled we could not have straddled you could not have straddled they could not have straddled
V-ing perfect
I could not have been straddling you could not have been straddling she could not have been straddling we could not have been straddling you could not have been straddling they could not have been straddling
Interrogative form
Simple form
could I straddle? could you straddle? could she straddle? could we straddle? could you straddle? could they straddle?
V-ing form
could I be straddling? could you be straddling? could she be straddling? could we be straddling? could you be straddling? could they be straddling?
Perfect
could I have straddled? could you have straddled? could she have straddled? could we have straddled? could you have straddled? could they have straddled?
V-ing perfect
could I have been straddling? could you have been straddling? could she have been straddling? could we have been straddling? could you have been straddling? could they have been straddling?
Interro-negative form
Simple form
could I not straddle? could you not straddle? could she not straddle? could we not straddle? could you not straddle? could they not straddle?
V-ing form
could I not be straddling? could you not be straddling? could she not be straddling? could we not be straddling? could you not be straddling? could they not be straddling?
Perfect
could I not have straddled? could you not have straddled? could she not have straddled? could we not have straddled? could you not have straddled? could they not have straddled?
V-ing perfect
could I not have been straddling? could you not have been straddling? could she not have been straddling? could we not have been straddling? could you not have been straddling? could they not have been straddling?