是谁呀

who is it?

→ 是
phrase Uncommon #8,676
who is it? 呀 gives the question a conversational, often slightly softer tone.
CH: 门口是谁呀?
EN: Who’s at the door?

她是谁呀?

Who is she?

— 我的父亲母亲 (1999)

是谁呀

Who is it?

— 办公室的故事 (1977)

那个人是谁呀

Who is that person?

— 大红灯笼高高挂 (1991)

你是谁呀?

Who are you?

— 大红灯笼高高挂 (1991)

这个可爱的女孩是谁呀?

Who is this cute girl?

— 红猪 (1992)

我猜不出来是谁呀

I can't guess who it is.

— 办公室的故事 (1977)

是谁呀?

Who is it?

— 警察故事 (1985)

他妈的是谁呀

Who the hell is it?

— 控制 (2007)

你管我是谁,你是谁呀

Who cares who I am? Who are you, anyway?

— Lost in Thailand (2012)

馒头,有庆是谁呀?

Mantou, who is Youqing?

— 活着 (1994)

你到底是谁呀

Who are you, anyway?

— Deep Sea (2023)

他是谁呀

Who is he?

— Lost in Thailand (2012)

那个男人是谁呀?

Who is that man?

— 阿飞正传 (1990)