1. 定语从句引导词选择依据。 ▶▶▶▶▶The Attributive Clause→在句子中修饰或限定名词，代词的从句就是定语从句 引导词取决于先行词在定语从句中做什么成分； 做主\宾或表语用关系代词，做状语用关系副词 1)These are the trees ____ were planted last year。 2)This is the park _____they visited last year. 3)I’ll never forget the day _____ I first went to Beijing.