你的句子没有标点，所以可以有两句理解。
听！隔壁有人唱歌。
listen! someone is singing next door.
听见隔壁有人唱歌。
i hear someone is singing next door.
意思也差不太多，都表示，现在正有人在唱歌。
Listen！ Someone's singing in the next room.
Listen！ Someone's singing in the next door.
Listen!There is someone singing next door.
希望能帮助你！
Listen！ Someone is singing in the next room.
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