that引導(dǎo)同位語(yǔ)從句時(shí)，同位語(yǔ)從句的先行詞多為抽象名詞，如fact，news，hope，question，report，idea，rumour等，而此時(shí)從句的連詞that只起連接作用，對(duì)抽象名詞進(jìn)行解釋和說(shuō)明。that 在從句中不作任何成分，但不能省略。如：
Many young people hold the idea that certificates and work experience help a lot in their job hunting.
許多年輕人有這樣一個(gè)理念，證書(shū)和工作經(jīng)歷對(duì)他們的求職作用很大。
The news that his heath is failing made us sad.
他健康狀況不佳的消息使我們很難過(guò)。
The question who should do the work requires consideration.
誰(shuí)該干這項(xiàng)工作的問(wèn)題需要考慮。
There is much chance that Bill will recover from his injury in time for the race.
有很大的機(jī)會(huì)比利的傷勢(shì)可以恢復(fù)并且按時(shí)參加比賽

that 引導(dǎo)同位語(yǔ)從句和定語(yǔ)從句的區(qū)別
1）從句法角度來(lái)看，引導(dǎo)同位語(yǔ)從句的連詞that只起連接作用，在從句中不作任何成分，但不可以省略；而引導(dǎo)定語(yǔ)從句的關(guān)系代詞that除了連接主句和從句之外，在從句中作一定成分，有時(shí)可省略。
Along with the letter was his promise that he would visit me this coming Christmas.
隨信一起來(lái)的是他的承諾，他說(shuō)會(huì)在即將到來(lái)的圣誕節(jié)來(lái)看我。（同位語(yǔ)從句中的that不做任何成分）
The suggestion (that) he made at the meeting was very right.
他在會(huì)議上給出的建議是正確的。（此定語(yǔ)從句中的that在從句中作賓語(yǔ)，可以省略）
2）從語(yǔ)義角度來(lái)看，同位語(yǔ)從句that引導(dǎo)的從句在句中解釋說(shuō)明前面的名詞，而定語(yǔ)從句中that引導(dǎo)的從句則是起到修飾限定先行詞的作用。
The news that we are having a holiday tomorrow is not true.
明天放假的消息不實(shí)。（that引導(dǎo)的從句說(shuō)明news的內(nèi)容）
He lost his money that had been saved for a long time.
他丟了存了很久的錢(qián)。（that引導(dǎo)的定語(yǔ)從句，修飾限定先行詞money）