I can waffle you can waffle he can waffle we can waffle you can waffle they can waffle
V-ing form
I can be waffling you can be waffling he can be waffling we can be waffling you can be waffling they can be waffling
Perfect
I can have waffled you can have waffled he can have waffled we can have waffled you can have waffled they can have waffled
V-ing perfect
I can have been waffling you can have been waffling he can have been waffling we can have been waffling you can have been waffling they can have been waffling
Negation
Simple form
I cannot waffle you cannot waffle he cannot waffle we cannot waffle you cannot waffle they cannot waffle
V-ing form
I cannot be waffling you cannot be waffling he cannot be waffling we cannot be waffling you cannot be waffling they cannot be waffling
Perfect
I cannot have waffled you cannot have waffled he cannot have waffled we cannot have waffled you cannot have waffled they cannot have waffled
V-ing perfect
I cannot have been waffling you cannot have been waffling he cannot have been waffling we cannot have been waffling you cannot have been waffling they cannot have been waffling
Interrogative form
Simple form
can I waffle? can you waffle? can he waffle? can we waffle? can you waffle? can they waffle?
V-ing form
can I be waffling? can you be waffling? can he be waffling? can we be waffling? can you be waffling? can they be waffling?
Perfect
can I have waffled? can you have waffled? can he have waffled? can we have waffled? can you have waffled? can they have waffled?
V-ing perfect
can I have been waffling? can you have been waffling? can he have been waffling? can we have been waffling? can you have been waffling? can they have been waffling?
Interro-negative form
Simple form
can I not waffle? can you not waffle? can he not waffle? can we not waffle? can you not waffle? can they not waffle?
V-ing form
can I not be waffling? can you not be waffling? can he not be waffling? can we not be waffling? can you not be waffling? can they not be waffling?
Perfect
can I not have waffled? can you not have waffled? can he not have waffled? can we not have waffled? can you not have waffled? can they not have waffled?
V-ing perfect
can I not have been waffling? can you not have been waffling? can he not have been waffling? can we not have been waffling? can you not have been waffling? can they not have been waffling?