I think that-1 that-2 that-3 that-4 that-5 student wrote on the blackboard was wrong.
為了看的方便,把5個(gè)that都依次編上號(hào),下面進(jìn)行拆
1. I think (that-1) that-2 that-3 was wrong （that-1,連接詞,后接賓語(yǔ)從句,自身無意義,可省略；that-2,指示代詞,“那個(gè)”；that-3,指的是寫在黑板上的單詞“that”）
2. that-2 that-3 that-4 that-5 students wrote on the blackboard was wrong （that-4,連接代詞,引導(dǎo)定語(yǔ)從句,代替寫在黑板上的單詞'that'做定語(yǔ)從句（that student wrote on the blackboard）中wrote的賓語(yǔ)）
3. that-5 student wrote on the blackboard （that-5,指示代詞,“那個(gè)”學(xué)生）
全句意為：我認(rèn)為那個(gè)學(xué)生在黑板上寫的那個(gè)單詞（that）是錯(cuò)誤的.
這個(gè)句子充滿娛樂精神,但沒有用武之地,于交流無益；如果想表達(dá)相同語(yǔ)意,可以改寫為：
I think the that which the student wrote on the blackboard was wrong.
限定詞the 代替 指示代詞 that
連接代詞which 代替 連接代詞 that
賓語(yǔ)從句連接詞that 可省略