(-) ….……….….………….
(?) ………………………?
(+) …………………………..
(-) …………………………..
(?) Where are they swimming now?
(+) my mother is cooking right now.
(+) my mother is cooking right now.
(-) my mother is not cooking right now.
(?) what my mother is cooking right now.
(+) they are swimming now
(-) they are not swimming now
(?) Where are they swimming now?