请问As might be expected,the plane hasn't arrived yet.里为什么要用mi

请问As might be expected,the plane hasn't arrived yet.里为什么要用mi The plane hasn't arrived yet.Could you tell me________? The plane hasn’t arrived yet.Could you tell me____? The train hasn't arrived yet hasn't your friend arrived yet? as might be expected的用法 The train hasn't arrived yet.Could you tell me _________? The train is leaving right now but David hasn't arrived yet -The train is leaving right now,but Lucy hasn't arrived yet. --The plane is leaving right now,but Jim hasn't arrive yet.- How come Susan hasn't arrived here yet? hasn't arrived yet 这句的语法讲解