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我听到有人在

I heard someone …ing

→ 我
phrase Rare #32,228
I heard someone …ing 在 introduces an action that someone is doing; the action verb follows this phrase.
CH: 我听到有人在说话。
EN: I heard someone talking.

“我听到有人在抱怨了。”

I heard someone complaining.

我听到有人在哭

I heard someone crying.

— 罗生门 (1950)

我听到有人在唱歌。

I hear someone singing.

我听到有人在敲门

I heard someone knocking at the door.

— 回归 (2006)