Unit 8 一)现在完成时1.过去某一时间点发生的动作对现在产生影响。2.过去某一时间点发生的动作持续 到现在或还将持续下去。二)基本结构have / has + done 三)关键词1. already 用于肯定句，yet 用于疑问句和否定句中A: _ your brother _ his homework yet? (finish) B: Yes, hes already done it.2. ever 曾经 用于疑问句中 never 从不 带有否定意义A: _ you ever _ to the park? ( be ) B: No, never. 3. just 刚刚(与现在完成时连用) 一般置句中 just now 刚才 与一般过去时连用I _ just _ the desk, you can take it to your classroom . (me
