I can straddle you can straddle he can straddle we can straddle you can straddle they can straddle
V-ing form
I can be straddling you can be straddling he can be straddling we can be straddling you can be straddling they can be straddling
Perfect
I can have straddled you can have straddled he 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 he 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 he cannot straddle we cannot straddle you cannot straddle they cannot straddle
V-ing form
I cannot be straddling you cannot be straddling he cannot be straddling we cannot be straddling you cannot be straddling they cannot be straddling
Perfect
I cannot have straddled you cannot have straddled he 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 he 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 he straddle? can we straddle? can you straddle? can they straddle?
V-ing form
can I be straddling? can you be straddling? can he be straddling? can we be straddling? can you be straddling? can they be straddling?
Perfect
can I have straddled? can you have straddled? can he 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 he 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 he 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 he 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 he 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 he not have been straddling? can we not have been straddling? can you not have been straddling? can they not have been straddling?