YOU SAID:
He is acting very suspicious, you should kick him
INTO JAPANESE
彼は非常に不審な行動をしているので、彼を蹴るべきである
BACK INTO ENGLISH
he should kick him because he is behaving very suspiciously
INTO JAPANESE
彼は非常に不審な振る舞いをしているので、彼を蹴るべきである
BACK INTO ENGLISH
he should kick him because he is behaving very suspiciously
That didn't even make that much sense in English.