只能給你寫這么多了!我也累的
先行詞（n/pron） +關(guān)代/副 +定從
主語(yǔ)賓語(yǔ) 定語(yǔ)表語(yǔ)
人who/thatwho/whom/that/-whose that
物which/thatwhich/that/- whose that
〔注：關(guān)系代詞作用：①代替作用②連接作用③在定語(yǔ)從句中充當(dāng)成分（主語(yǔ),定語(yǔ),賓語(yǔ),定語(yǔ)）〕
下列情況只用that而不用which
something（指物的不定代詞） the first+n（序數(shù)詞）the very+n（正是） the best+n（最高級(jí)） just+the+n the only+nall/few/little all/few/litter/any/some+n 人+物
2.October 1.1949 is a special day（that/which/—）China was found on.
October 1.1949 is a special day（on which=when）Chaina was founded.