replace relative clauses by participle or to infinitive the man ''who is talking to john'' is from korea the ideas ''which are presented in this book '' are good enghlish has an alphabet ''that consists of 26 letters'' anymore ''who want to come with us'' is welcome he was the last person''who saw her alive'' my brother was the only one ''who realized the danger'' the queen elizabth is the largest ship''which has been built on the clyde'' cấu chữ trong dấu '' '' là các chữ in đậm