同位語從句壹般跟在名詞fact, hope, idea, news, doubt, suggestion, information, opinion, decision, discovery, truth, promise, statement, problem, rule等的面。
They were all very much worried over the fact that you were sick. 對妳生病這件事，他們都很焦慮。
Where did you get the idea that I could not come 妳在哪兒聽說我不能來？
I have no idea whether he'll come or not. 我不知道他是否來。
在壹些表示建議、命令、要求的名詞後的同位語從句中，謂語動詞用should+動詞原形表示，should可省略。
This is our only request that this (hould) be settled as soon as possible. 盡快解決這個問題，這是我們唯壹的請求。
He made the suggestion that we go by train. 他建議我們坐火車去。