I can still you can still she can still we can still you can still they can still
V-ing form
I can be stilling you can be stilling she can be stilling we can be stilling you can be stilling they can be stilling
Perfect
I can have stilled you can have stilled she 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 she can have been stilling we can have been stilling you can have been stilling they can have been stilling
Negation
Simple form
I can't still you can't still she can't still we can't still you can't still they can't still
V-ing form
I can't be stilling you can't be stilling she can't be stilling we can't be stilling you can't be stilling they can't be stilling
Perfect
I can't have stilled you can't have stilled she can't have stilled we can't have stilled you can't have stilled they can't have stilled
V-ing perfect
I can't have been stilling you can't have been stilling she can't have been stilling we can't have been stilling you can't have been stilling they can't have been stilling
Interrogative form
Simple form
can I still? can you still? can she still? can we still? can you still? can they still?
V-ing form
can I be stilling? can you be stilling? can she be stilling? can we be stilling? can you be stilling? can they be stilling?
Perfect
can I have stilled? can you have stilled? can she 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 she have been stilling? can we have been stilling? can you have been stilling? can they have been stilling?
Interro-negative form
Simple form
can't I still? can't you still? can't she still? can't we still? can't you still? can't they still?
V-ing form
can't I be stilling? can't you be stilling? can't she be stilling? can't we be stilling? can't you be stilling? can't they be stilling?
Perfect
can't I have stilled? can't you have stilled? can't she have stilled? can't we have stilled? can't you have stilled? can't they have stilled?
V-ing perfect
can't I have been stilling? can't you have been stilling? can't she have been stilling? can't we have been stilling? can't you have been stilling? can't they have been stilling?