The police are combing through the mountains looking for two missing students.

請問 looking for two two missing student 在這是做 be 動詞的補語嗎?
書上有提到動詞以分詞的形式做補語時,不及物一率要變成現在分詞所以這邊才要用 looking 嗎?

再請問為什麼要寫成 missing student 而不是 missed student,是因為不會自己走丟所以要用主動嗎?

The police come down hard on anyone who is caught going through red lights.

anyone (who is caught) going through red lights-這一句的going怎麼沒有 be 動詞?

放暑假問不到老師,希望有人可以解答.. 謝謝.