I can waddle you can waddle he can waddle we can waddle you can waddle they can waddle
V-ing form
I can be waddling you can be waddling he can be waddling we can be waddling you can be waddling they can be waddling
Perfect
I can have waddled you can have waddled he 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 he can have been waddling we can have been waddling you can have been waddling they can have been waddling
Negation
Simple form
I cannot waddle you cannot waddle he cannot waddle we cannot waddle you cannot waddle they cannot waddle
V-ing form
I cannot be waddling you cannot be waddling he cannot be waddling we cannot be waddling you cannot be waddling they cannot be waddling
Perfect
I cannot have waddled you cannot have waddled he cannot have waddled we cannot have waddled you cannot have waddled they cannot have waddled
V-ing perfect
I cannot have been waddling you cannot have been waddling he cannot have been waddling we cannot have been waddling you cannot have been waddling they cannot have been waddling
Interrogative form
Simple form
can I waddle? can you waddle? can he waddle? can we waddle? can you waddle? can they waddle?
V-ing form
can I be waddling? can you be waddling? can he be waddling? can we be waddling? can you be waddling? can they be waddling?
Perfect
can I have waddled? can you have waddled? can he 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 he have been waddling? can we have been waddling? can you have been waddling? can they have been waddling?
Interro-negative form
Simple form
can I not waddle? can you not waddle? can he not waddle? can we not waddle? can you not waddle? can they not waddle?
V-ing form
can I not be waddling? can you not be waddling? can he not be waddling? can we not be waddling? can you not be waddling? can they not be waddling?
Perfect
can I not have waddled? can you not have waddled? can he not have waddled? can we not have waddled? can you not have waddled? can they not have waddled?
V-ing perfect
can I not have been waddling? can you not have been waddling? can he not have been waddling? can we not have been waddling? can you not have been waddling? can they not have been waddling?