Unit2 核心詞匯講解1. warn /wn/ v. 警告He warned us against pickpockets.他提醒我們注意小偷?！就卣埂抗潭ù钆洌簑arn sb of/about sth 警告某人關(guān)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! 請(qǐng)開著門！【拓展】(1) keep+ adj. 處于的狀態(tài) keep healthy! 保持健康！(2) keep sb/sth + adj 使某人/某物處于的狀態(tài)。keep 的過去式和過去分詞是kept，屬于不規(guī)則變化。3. clear / kl/ adj. 清晰的；不和接觸The question is clear. 問題很清楚。Make sure you park you car clear of the entrance.切莫將車停在入口住?！就卣埂颗缮~：clearly adv. 清晰地4. brave / brev/ adj. 勇敢的，無畏的Be brave! 勇敢一些！【拓展】派生詞：bravely adv. 勇敢地5. helpful / 'helpfl/ adj. 有用的Thank you. You were very helpful. 謝謝你們。你們幫了大忙?！就卣埂糠戳x詞：helpless adj. 沒有用的，無助的 1 / 1