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 can't straddle you can't straddle he 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 he 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 he 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 he 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 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't I straddle? can't you straddle? can't he 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 he 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 he 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 he have been straddling? can't we have been straddling? can't you have been straddling? can't they have been straddling?