英語四級經典必背500句：聽力口語關鍵句49 　　49.I was under the impression that the tickets were sold out a long time ago. 　　四級詞匯講解: 　　be under the impression that 意為 認為，覺得 ，該種表達不常見，因此是本句的難點。其實它相當于think或者have the feeling that 。如: 　　I was under the impression that he was kind.我的印象中他挺善良的。 　　Im under the impression that language is complex.我覺得語言挺復雜的。 　　I am under the impression that it will rain in the afternoon.我覺得下午會下雨。