一、首先,分析第一句：i like the small but beautiful garden that was built last year.此句话的意思是我喜欢去年建的那座小而美的花园.that was built last year是修饰garden的定语从句,was 和last year从句中是相对garden而言 ,而整句话是一般时,主干是I like the （small but beautiful） garden .二、句子变换:The bedroom which is full of flowers given by Tom is theirs.限定性从句里面,that有时可以和which who 等引词互换的,具体情况具体分析