有一

have a

→ 有
phrase Extremely common #182
have a Usually followed by a measure word and a noun, such as 有一块钱 (have one yuan) or 有一份副本 (have a copy).
CH: 我有一本中文书。
EN: I have a Chinese book.

汤姆有一架钢琴吗?

Does Tom have a piano?

因为在那堵墙内有一扇窗户.

Because there is a window in that wall.

— 杀手疾风号 (2022)

有一个好消息要告诉您…

I have some good news to tell you…

— 记忆中的玛妮 (2014)

我有一台电脑。

I have a computer.

上次有一客人

Last time, there was a customer.

— Deep Sea (2023)