it 形式主語
can't be謂語動(dòng)詞
more important 表語
than介詞
what is stated in the book賓語從句
that is the preciousness of time and the method to use it efficiently此句是真正的主語,它是主語從句,其中that是主語 is是謂語動(dòng)詞 the preciousness of time and the method to use it efficiently是表語不是說that引導(dǎo)主語從句時(shí)不做從句成分嗎？這里的that是作具體成分的，不是引導(dǎo)詞哈，因?yàn)檫@個(gè)that is the preciousness of time and the method to use it efficiently句子里面去掉that就少了主語了，當(dāng)一個(gè)完整句子要做從句時(shí)，才需要用that這種不做成分的引導(dǎo)詞來引導(dǎo)有問題，請(qǐng)追問，如滿意，請(qǐng)采納