Unit 3 Computers现在完成时被动语态（教师版）

复习现在完成时主动语态 一．语法热身练习用括号中所给词的正确形式填空。1. The students ________ (clean) the windows of the classroom half an hour ago. 2. The students _________________ (clean) the windows of the classroom since half an hour ago.3. So far, many countries ____________ (develop) their software programs. 4. Up till now, I _________(read) the novel twice. It’s interesting.5. She ________ (go) to Pairs, hasn’t she? —Yes, she has. —How ____ she ___ (go) there? —She _____ (go) there by air.6. The boy has already ________(finish) his homework, so he went out for a walk.cleaned have cleaned have developed have read has gone did go went 思考：练习 1 和 2 时态的区别：一般过去时表示动作发生在过去，其结果对现在没有影响；完成时表示动作或状态尽管发生在过去，但侧重说明该动作或状态对现在造成的影响和结果。二．现在完成时(主动语态)1. 结构：have/has + done （根据语法热身 2.3.4.5 填写）2. 概念与用法：① 表示过去发生或已经完成的某个动作对现在产生的影响或结果。(语法热身 3, 4, 5, 6)经常和 already, yet, just 等连用。(语法热身 6)② 表示过去已经开始、持续到现在(可能还会继续下去)的动作和状态。（语法热身 2）常与下列时间短语连用:1. for + 一段时间；since + 时间点/ 从句2. so far, up till now, up to now，until now 迄今为止，至今3. for/in /during the last/past …years/months/ weeks) 在最近的……年/月/星期里4.最近：recently, lately, in recent years5. 从……以来: ever since It is (has been) + 一段时间 + since 从句This (That / It) is the first (second…) time that + 完成时This (that / It) is the best / finest / most interesting … + that 从句 + 完成时三．现在完成时被动语态构成根据例句写出现在完成时被动语态的构成。句式例句构成肯定句A plan has been made.have/has been done 否定句My computer has not been repaired.have/has not been done 一般疑问句Have the problem been solved yet?Hav...