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