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　　I [aɪ] pron. 我

　　ice [aɪs] n. 冰

　　ice-cream [aɪs- kriːm] n. 冰淇淋

　　Iceland [ˈaɪslənd] * n. 冰岛

　　idea [aɪˈdɪə] n. 主意,意见,打算,想法

　　have some/no idea + 从句/of… 知道/不知道......

　　I have no idea why she left.

　　I have no idea of his address.

　　identity [aɪˈdentɪtɪ] n. 身份, 特征

　　The police are trying to discover the identity of the killer.

　　The thief used a false identity.

　　identity card=ID card 身份证

　　identification [aɪdentɪfɪˈkeɪʃ(ə)n] n. 鉴定, 辨别

　　idiom [ˈɪdɪəm] n. 习语, 成语

　　if [ɪf] conj.如果,假使,是否,是不是

　　ignore [ɪɡˈnɔː(r)] v. 忽视, 对…不理会

　　ill [ɪl] a. 有病的;不健康的

　　ill与sick的区别：

　　ill当生病讲时只做表语，sick当生病讲时可做表语也可作定语。

　　He was ill/sick.

　　a sick mother

　　have a bad/an ill effect on 对...…影响不好

　　speak/think ill of sb. 说某人的坏话

　　illegal [ɪˈliːɡ(ə)l] a. 非法的

　　It is illegal to drive through a red light.

　　illegally adv.

　　He entered the country illegally.

　　illness [ˈɪlnɪs] n. 疾病

　　imagine [ɪˈmædʒɪn] vt. 想像, 设想

　　imagine sth./doing sth.

　　I can’t imagine life without the children now.

　　I can’t imagine his becoming a teacher.