Unit3 Online tours Grammar课件-2023-2024学年牛津译林版八年级英语下册

牛津译林版八年级英语下册 Unit3 Online tours Grammar 语言知识 掌握现在完成时和一般过去时的区别： 1. 区别定义 2. 区别语法结构 3. 区别时间标志词 G o a l s Read and tell the difference: Daniel went to Beijing two years ago. Daniel has lived in Beijing for two years. Work out the rule: We use________________ to tell what happened in the past. We use________________ to talk about an action that started in the past and continues(继续) to the present. the simple past tense the present perfect tense the simple past tense(一般过去时) the present perfect tense(现在完成时) Wise men learn by other men's mistakes; fools by their own Read and tell the difference: Daniel bought a new computer last month. Daniel has bought a new computer. Does Daniel still have the computer now? We are not sure.We can just know he bought it last month. Yes. Daniel has a computer now. But we don’t know when he bought it. Wise men learn by other men's mistakes; fools by their own Let’s do some exercises 用所给动词的适当形式填空。 Wise men learn by other men's mistakes; fools by their own We often use these time expressions with the simple past tense: yesterday the other day last... ...ago Wise men learn by other men's mistakes; fools by their own We often use these time expressions with the present perfect tense: already up to now ever until/till now just so far recently (not) yet Wise men learn by other men's mistakes; fools by their own 时间状语不同 现在完成时 副词作标志词：just, already, yet since + 时间点/(时间段+ago)/一般过去时句子；for + 时间段 表示次数的时间状语：once, twice, three times, ever, never 一般过去时 过去时间点：just now, at that time, yesterday, this morning, three years ago等 过去时间段：in the past, in + 过去的年份, last week, once upon a time等 “最近”：lately，recently “迄今为止”：so far, till now, up to now Wise men learn by other men's mistakes; fools by their own 区 别： 定 义 一般过去时 现在完成时