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 can't straddle you can't straddle she can't straddle we can't straddle you can't straddle they can't straddle
V-ing form
I can't be straddling you can't be straddling she can't be straddling we can't be straddling you can't be straddling they can't be straddling
Perfect
I can't have straddled you can't have straddled she can't have straddled we can't have straddled you can't have straddled they can't have straddled
V-ing perfect
I can't have been straddling you can't have been straddling she can't have been straddling we can't have been straddling you can't have been straddling they can't 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't I straddle? can't you straddle? can't she straddle? can't we straddle? can't you straddle? can't they straddle?
V-ing form
can't I be straddling? can't you be straddling? can't she be straddling? can't we be straddling? can't you be straddling? can't they be straddling?
Perfect
can't I have straddled? can't you have straddled? can't she have straddled? can't we have straddled? can't you have straddled? can't they have straddled?
V-ing perfect
can't I have been straddling? can't you have been straddling? can't she have been straddling? can't we have been straddling? can't you have been straddling? can't they have been straddling?