英文句子問題 詳細如下?

Question

police don't know if the explosion was accidental or caused by a bomb

和

police don't know the explosion was accidental or caused by a bomb

相差只是少了一個if，到底有什麼差別?

Answer 1

最愛解答

---Police don't know the if-clause,that clause, noun clause to indicate that an event is likely or unlikely caused.ie:-subordinate clause.

Answer 2

有if時，名詞子句是靠連接詞if所帶領出來的。沒有if時，是名詞子句前面的連接詞that遭省略了。兩者的意思相同，都是警方對名詞子句所述不瞭解。