名詞性從句出現的時候，必須要有主句，否則句子不完整。

例如:The fact that education is the key to a country’s long term success.

這句話就是錯的，the fact 引導同位語從句，并沒有主句。

應該改為:Government funding is supported by the fact that education is the key to a country’s long-term success.