一、省去作主语的关系代词致错
误:The changes have happened in the past few years make the city look even more beautiful.
正:The changes that have happened in the past few years make the city look even more beautiful.
误:Those want to visit the art exhibition sign your names,please.
正:Those who want to visit the art exhibition sign your names,please.
分析:关系代词在定语从句中作宾语时可以省,但作主语时不能省。