`1` Are you tired `?`

`2` Is this your pen `?`

`3` Is she your friend `?`

`4` Am I on this class `?`

`5` Are your teeth hurt `?`

`6` Is this your phone `?`

`7` Is the chair broken `?`

`8` Is the library open `?`

`9` Are those people hungry `?`

`10` Is Mr.Sarah his teacher `?`

`-` Hành động thường diễn ra ở hiện tại .

`->` Hiện tại đơn .

`(+)` S + is/am/are + O .

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

`(?)` Is/am/are + S + O `?`