respectful: 指“充满敬意的”，是主动性的尊重他人。如：The students were very respectful towards the great man.(这些学生对这位伟人十分敬仰。)
respected: 表示受人尊敬的，可用于对年长的人，权威性的意见等。
respective: 表“各自分别的”，修饰名词时，名词一般用复数。如：They went back to their respective houses.(他们回了各自的家。)
respectable: 可尊敬的，值得尊重的。如：His parents were poor but respectable.(他父母虽穷却令人尊敬。)