主語(yǔ)從句是名詞性從句中的一種,在句子中充當(dāng)主語(yǔ)。請(qǐng)仔細(xì)閱讀下面課本中的主語(yǔ)從句,體會(huì)其引導(dǎo)詞的用法。本期主要講解一下主語(yǔ)從句引導(dǎo)詞的使用。
What is even more important is that as the earth cooled down, water began to appear on its surface. (P26)
Why they suddenly disappeared still remains a mystery. (P26)
So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. (P26)
引導(dǎo)主語(yǔ)從句的連接詞有以下幾種:
一、連詞that和whether
that引導(dǎo)主語(yǔ)從句時(shí),只起引導(dǎo)作用,沒(méi)有具體意義,在從句中也不作任何成分,但通常不能省略。如:
That the college will take in more new students this year is true.
whether引導(dǎo)主語(yǔ)從句時(shí),表示主語(yǔ)從句意義的不確定性,在從句中不作成分,但有意義,作“是否”解。如:
Whether he can finish his task on time is of great importance.
一般說(shuō)來(lái),已經(jīng)確定的事情由that引導(dǎo),沒(méi)有確定的事情由whether引導(dǎo)。