英語中引導(dǎo)同位語從句的詞通有連詞 that,whether,連接副詞 how,when,where等.（注：if,which 不能引導(dǎo)同位語從句.）如:
I have no idea when he will be back．我不知道他什么時候回來.
He must answer the question whether he agrees to if or not.
他必須回答他是否同意這樣一個問題.
另外,where,when,why,how,who,what等在引導(dǎo)同位語從句時,一般只用于I have no idea ...結(jié)構(gòu)中,但有人認(rèn)為,其實這種類型的同位語從句應(yīng)該列入賓語從句的范疇,因為I have no idea意思就是I don't know ...
如：I have no idea where I should go.
I have no idea how I can get to the railway station