Let me know if you see anyone acting suspiciously.

如发现有人形迹可疑，你就告诉我。

《牛津词典》

The aforementioned person was seen acting suspiciously.

有人看见前面提到的那个人行动可疑。

《牛津词典》

They'll question them as to whether anyone was seen acting suspiciously in the area over the last few days.

他们将询问这些人过去几天是否在该地区发现行迹可疑的人。

《柯林斯英汉双解大词典》

He claims he shot Martin in self-defense after Zimmerman saw the teenager acting suspiciously in the neighborhood.

CNN: SHARE THIS

But on 3 June he was spotted acting suspiciously by an officer in the city centre and was arrested.

BBC: Eithan Teanby jailed for post office and bank robbery

Police Commissioner Jackie Selebi is reported as saying that two white men were seen acting suspiciously in Soweto shortly before the explosions.

BBC: Mosque in Soweto