`1`. She's playing volleyball with her brother.
(-) She isn't playing volleyball with her brother. 
(?) Is she playing volleyball with her brother? 
`2`. It's snowing now.
(-) It isn't snowing now.
(?) Is it snowing now?
`3`.We are speaking English with a foreigner.
(-) We aren't speaking English with a foreigner.
(?) Are we speaking English with a foreigner?

`4`.Thompson is writing in his notebook.
(-) Thompson isn't writing in his notebook.
(?) Is Thompson writing in his notebook?
`5`. I am playing a computer game with my father.
(-) I am not playing a computer game with my father.
(?) Am I playing a computer game with my father?

`**` Công thức thì hiện tại tiếp diễn

(`+`) S `+` is/am/are `+` V-ing `+`...

(`-`) S `+` is/am/are `+` not `+` V-ing `+`...

(`?`) Is/am/are `+` S `+` V-ing `+`...?