1/
(+) Students are in class .
(-) Students are not in class .
(?) Are students in class ?
2/
(+) Mr, Minh is an engineer
(-) Mr, Minh is not an engineer
(?) Is mr, Minh an engineer ?
3/
(+) There is a television in the living room
(-) There isn't a television in the living room
(?) Is there a television in the living room ?
4/
(+) I am a worker
(-) I am not a worker
(?) Are you a worker ?
5/
(+) There are her books
(-) There aren't her books
(?) Are there her books ?
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