是他写的

was written by him

→ 是
phrase Rare #26,352
was written by him Used to identify him as the person who wrote something; the thing he wrote is often understood from context.
CH: 这封信是他写的。
EN: This letter was written by him.

这是他写的诗歌

This is the poem he wrote.

— 潜行者 (1979)

我的朋友是他写的

My friend was written by him.

— 英国病人 (1996)

不是我,是他写的。

It wasn't me; he wrote it.

— 俄罗斯方舟 (2002)

那是他写的

That was written by him.

— 两生花 (1991)

“明镜”那篇报导根本就是他写的

He was the one who wrote that report for Mingjing.

— 窃听风暴 (2006)