【文法解析】關係代名詞與複合關代
【定義】關係（→連接詞）＋代名詞＝關係代名詞→前面一定有先行詞（在前面的「名詞」）
e.g. I'm looking for a guy. He is not only nice but high-educated.
= I'm looking for a guy, and he is not only nice but high-educated.
= I'm looking for a guy who is not only nice but high-educated.
※關代需與先行詞一致┬人┬主格 who
│ └受格 whom
├動物、事物 which
└人、動物、事物 that
※關代：當主詞，不可省！當受詞，可省略！
※whom 在正常情況可與 that 代換。例外：與介係詞連用，不可用 that！
e.g. The girl whom Eric is talking to is Linda.
= The girl to whom Eric is talking to is Linda.
= The girl Eric is talking to is Linda.
= The girl to that Eric is talking to is Linda.
※補述用法：要不要逗號？
強調限定那一個→獨一無二→沒有人一樣，不用限定是哪個
（非限定）→純粹補充說明→要逗號隔開 cf. 有逗號→非限定（受詞不可省略！）；沒逗號→限定
※that 的用法
(1)不可以：介係詞之後、補述用法
(2)可 以：先行詞有限定、人＋動物
※常考！重要！進階版～省略連接詞
e.g. Amy has lots of toys and all of them are her favorite.
= Amy has lots of toys, all of which are her favorite.（and 不見了！要換成關係代名詞，人 whom、物 which）
= Amy has lots of toys; all of them are her favorite.（and 不見了！但是換成分號就等於連接詞）
補充：複合關代┬定義→疑問詞＋ever
├名詞→Ex. whoever= anyone who └副詞→Ex. whoever= no matter who
cf. Whatever is cold is not good for a girl.（名詞）
=Anything which is cold is not good for a girl.（名詞）
=Whatever is cold, it's not good for a girl.（副詞）
=No matter what is cold, it's not good for a girl.（副詞）