1、用作定语▲~+n. She is a senior patient.她是一位高龄患者。2、用作表语▲S+be+~+prep.-phrase He is senior to me.他是我的上司。Smith is senior to me by three years.***比我大三岁。3、▲S+be+~+to-vHe is too senior to try for cabinet office.他年事已高,不宜去谋求内阁部长的职位了。