I can still you can still he can still we can still you can still they can still
V-ing form
I can be stilling you can be stilling he can be stilling we can be stilling you can be stilling they can be stilling
Perfect
I can have stilled you can have stilled he can have stilled we can have stilled you can have stilled they can have stilled
V-ing perfect
I can have been stilling you can have been stilling he can have been stilling we can have been stilling you can have been stilling they can have been stilling
Negation
Simple form
I cannot still you cannot still he cannot still we cannot still you cannot still they cannot still
V-ing form
I cannot be stilling you cannot be stilling he cannot be stilling we cannot be stilling you cannot be stilling they cannot be stilling
Perfect
I cannot have stilled you cannot have stilled he cannot have stilled we cannot have stilled you cannot have stilled they cannot have stilled
V-ing perfect
I cannot have been stilling you cannot have been stilling he cannot have been stilling we cannot have been stilling you cannot have been stilling they cannot have been stilling
Interrogative form
Simple form
can I still? can you still? can he still? can we still? can you still? can they still?
V-ing form
can I be stilling? can you be stilling? can he be stilling? can we be stilling? can you be stilling? can they be stilling?
Perfect
can I have stilled? can you have stilled? can he have stilled? can we have stilled? can you have stilled? can they have stilled?
V-ing perfect
can I have been stilling? can you have been stilling? can he have been stilling? can we have been stilling? can you have been stilling? can they have been stilling?
Interro-negative form
Simple form
can I not still? can you not still? can he not still? can we not still? can you not still? can they not still?
V-ing form
can I not be stilling? can you not be stilling? can he not be stilling? can we not be stilling? can you not be stilling? can they not be stilling?
Perfect
can I not have stilled? can you not have stilled? can he not have stilled? can we not have stilled? can you not have stilled? can they not have stilled?
V-ing perfect
can I not have been stilling? can you not have been stilling? can he not have been stilling? can we not have been stilling? can you not have been stilling? can they not have been stilling?