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 can't waffle you can't waffle he can't waffle we can't waffle you can't waffle they can't waffle
V-ing form
I can't be waffling you can't be waffling he can't be waffling we can't be waffling you can't be waffling they can't be waffling
Perfect
I can't have waffled you can't have waffled he can't have waffled we can't have waffled you can't have waffled they can't have waffled
V-ing perfect
I can't have been waffling you can't have been waffling he can't have been waffling we can't have been waffling you can't have been waffling they can't 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't I waffle? can't you waffle? can't he waffle? can't we waffle? can't you waffle? can't they waffle?
V-ing form
can't I be waffling? can't you be waffling? can't he be waffling? can't we be waffling? can't you be waffling? can't they be waffling?
Perfect
can't I have waffled? can't you have waffled? can't he have waffled? can't we have waffled? can't you have waffled? can't they have waffled?
V-ing perfect
can't I have been waffling? can't you have been waffling? can't he have been waffling? can't we have been waffling? can't you have been waffling? can't they have been waffling?