I can waddle you can waddle she can waddle we can waddle you can waddle they can waddle
V-ing form
I can be waddling you can be waddling she can be waddling we can be waddling you can be waddling they can be waddling
Perfect
I can have waddled you can have waddled she can have waddled we can have waddled you can have waddled they can have waddled
V-ing perfect
I can have been waddling you can have been waddling she can have been waddling we can have been waddling you can have been waddling they can have been waddling
Negation
Simple form
I can't waddle you can't waddle she can't waddle we can't waddle you can't waddle they can't waddle
V-ing form
I can't be waddling you can't be waddling she can't be waddling we can't be waddling you can't be waddling they can't be waddling
Perfect
I can't have waddled you can't have waddled she can't have waddled we can't have waddled you can't have waddled they can't have waddled
V-ing perfect
I can't have been waddling you can't have been waddling she can't have been waddling we can't have been waddling you can't have been waddling they can't have been waddling
Interrogative form
Simple form
can I waddle? can you waddle? can she waddle? can we waddle? can you waddle? can they waddle?
V-ing form
can I be waddling? can you be waddling? can she be waddling? can we be waddling? can you be waddling? can they be waddling?
Perfect
can I have waddled? can you have waddled? can she have waddled? can we have waddled? can you have waddled? can they have waddled?
V-ing perfect
can I have been waddling? can you have been waddling? can she have been waddling? can we have been waddling? can you have been waddling? can they have been waddling?
Interro-negative form
Simple form
can't I waddle? can't you waddle? can't she waddle? can't we waddle? can't you waddle? can't they waddle?
V-ing form
can't I be waddling? can't you be waddling? can't she be waddling? can't we be waddling? can't you be waddling? can't they be waddling?
Perfect
can't I have waddled? can't you have waddled? can't she have waddled? can't we have waddled? can't you have waddled? can't they have waddled?
V-ing perfect
can't I have been waddling? can't you have been waddling? can't she have been waddling? can't we have been waddling? can't you have been waddling? can't they have been waddling?