如发现有人形迹可疑，你就告诉我。

Let me know if you see anyone acting suspiciously.

一条形迹可疑的船向我们驶来。

A suspicious boat made up to us.

那名在学校附近形迹可疑的男子是谁？

Who is that suspicious-looking man near the school?

有天夜里，那个形迹可疑的人碰巧途经酒吧，下车喝酒。

Then one night, the suspicious-looking fellow happened to stop by for a drink.