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1、Unit2 核心词汇讲解1. warn /wn/ v. 警告He warned us against pickpockets.他提醒我们注意小偷。【拓展】固定搭配:warn sb of/about sth 警告某人关于某事warn sb to do sth 警告某人去做某事warn sb not to do sth 警告某人不要做某事2. keep / kip/ v. 保持,保留Please keep the door open! 请开着门!【拓展】(1) keep+ adj. 处于的状态 keep healthy! 保持健康!(2) keep sb/sth + adj 使某人/某物处于的状态
2、。keep 的过去式和过去分词是kept,属于不规则变化。3. clear / kl/ adj. 清晰的;不和接触The question is clear. 问题很清楚。Make sure you park you car clear of the entrance.切莫将车停在入口住。【拓展】派生词:clearly adv. 清晰地4. brave / brev/ adj. 勇敢的,无畏的Be brave! 勇敢一些!【拓展】派生词:bravely adv. 勇敢地5. helpful / helpfl/ adj. 有用的Thank you. You were very helpful. 谢谢你们。你们帮了大忙。【拓展】反义词:helpless adj. 没有用的,无助的 1 / 1