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作賓語和表語。如: ① Tell me the reason why he did not e. 告訴我他沒來的原因。( the reason why...作賓語) ② That is the reason why I am not in favour of it. 那就是我不贊成它的原因。( the reason why...作表語) 2. It is also important to know that English has borrowed many words from other languages. 了解英語中外來詞匯也是很重要的。 【 點(diǎn)撥 】 It is+adj.+to do 一件事的看法,意為“做某事怎么樣”。其中 it用作形式主語,真正的主語是句末的整個(gè)動(dòng)詞不定式部分。如: ① It is dangerous to drive a car at night without any lights. 晚上沒燈開車很危險(xiǎn)。 ② It’s necessary to do eye exercises twice a day. 一天做兩次眼保健操是必要的。