是个好女孩

is a good girl

→ 是
phrase Rare #24,475
is a good girl A compliment describing a girl or young woman as kind, well-behaved, or trustworthy. The subject can be omitted when clear from context.
CH: 她虽然年纪小,但已经是个好女孩了。
EN: Although she is young, she is already a good girl.

是个好女孩

She is a good girl.

— 双重赔偿 (1944)

是个好女孩

She’s a good girl.

— 记忆中的玛妮 (2014)

是个好女孩

You’re a good girl.

— 真爱至上 (2003)

其实不用担心我跟小燕是个好女孩

You really don't need to worry about Xiaoyan and me—she's a good girl.

— 一一 (2000)

是个好女孩.

You’re a good girl.

— 宝莱坞生死恋 (2002)