Unit5语法专项课件- because for since as原因状语从句2026-2027学年译林版九年级英语上册

这是一份初中英语同步教学课件，针对译林版九年级上册Unit5语法专项，聚焦because/for/since/as原因状语从句。内容包含学习目标、四词用法精讲、对比表格、标点规则及分层练习，为学生构建从基础理解到综合应用的学习支架。 资料特色显著，以结构化设计融合核心素养，通过对比表格清晰呈现四词语气、场景及位置差异，结合单项选择、句型转换等分层练习提升语言运用能力。记忆口诀和解题技巧培养思维品质与学习策略，助力九年级学生掌握中考核心考点，同时为教师提供系统教学资源，提升课堂效率。

教学课件 译林英语九年级上册 Unit5 语法专项 ——because/for/since/as原因状语从句 全解精讲+分层练习 1 1.掌握 because/for/since/as 四词语气、用法区别 2.分清四类连词句子位置、逗号使用规则 3.牢记回答 why 问句只能使用 because 核心考点 4.掌握 for 只能后置、不可放句首硬性规则 学习目标 连词一 because 精讲 1.四词里语气最强，表直接客观因果 2.用来回答 Why 提出的特殊疑问句（唯一可用连词） 3.从句可前置 / 后置；前置主句前必须加逗号 4.例句：Because Tan mixes nature sounds, his music is famous. because 后置例句对比 1.从句后置无需逗号分隔主句 2.例句：He admires Tan because his music carries Chinese culture. 3.问答模板：—Why do you love concerts? —Because they relax me. 4.考试判断线索：问句有 why，答案必用 because 5.无使用位置限制，写作使用范围最广 连词二 for 精讲 1.语气最弱，书面专用词，口语不使用 2.仅作事后补充推论，非直接因果关系 3.硬性规则：只能放在主句后面，不可句首 4.主句与 for 从句之间必须加逗号隔开 5.不能用来回答 why 问句 for 例句 1.We love this CD, for it includes Olympic music. 2.逗号不可省略，调换到句首直接判定错误 3.易错错句：For the song is beautiful, we listen daily. 连词三 since 精讲 1.语气偏弱，理由是双方都知晓的事实 2.从句可放句首或主句后方，灵活使用 3.从句置于句首，主句前添加逗号 4.例句：Since you play violin, you can join the show. 5.不用于回答 why 连词四 as 精讲 1.用法、语气与 since 完全等同，可互相替换 2.口语、书面两种场景都能使用 3.位置规则同 since，前置加逗号，后置无标点 4.例句：As the festival comes, students learn instruments. 5.二者无词义差别，题目经常同时作为正确选项 四词对比总结表格 连词 语气 使用场景 位置限制 答 why because 最强 未知直接因果 前后均可 √唯一可用 for 最弱 书面推论补充 仅主句后，逗号 × since 偏弱 已知事实理由 前后均可 × as 偏弱 已知事实理由 前后均可 × 标点通用规则梳理 1.从句放句首：because/since/as 后，主句前加逗号 Since music is great, we listen every day. 2.从句放句末：because/since/as 不加逗号 3.for 永远在句末，主句和 for 之间必须逗号 4.标点改错高频扣分点，书写重点注意 5.口诀：前从句加逗号，for 末尾必带逗 解题判断技巧第一步 1.看题目是否有 Why 问句→直接选 because 2.连词在句子开头→排除 for，剩 because/since/as 3.连词在句末、中间有逗号→优先考虑 for 4.理由是众人皆知→since/as 二选一 5.理由全新、客观直接→选用 because 题型一 单项选择 1.—Why do you like folk music? —________ it’s full of culture. A.For B.Because C.Since D.As 2.His songs are popular, ________ they mix east and west styles. A.because B.for C.since D.as 3.________ you play guitar well, you can join the show. A.For B.Since C.Why D.Because 4.We seldom buy CDs ________ their prices are too high. A.for B.as C.because D.since B B B C 5.________ the concert starts early, we leave home at five. A.For B.Since C.As D.B&C 均可 6.You won’t feel bored, ________ it has natural instrument sounds. A.because B.for C.since D.as 7.—Why do you practise piano daily? —________ I want to perform. A.As B.Since C.For D.Because 8.The musician is special ________ he uses stone for music. A.for B.because C.as D.since D B D B 9.________ you hate loud rock, let’s listen to soft piano. A.SinceB.For C.AsD.A&C 均可 10.Everyone loves his show, ________ every note is warm. A.because B.for C.as D.since 11.________ kids love instruments, the school opens music classes. A.For B.Since C.AsD.Because 12.We respect Tan ________ he spreads Chinese music worldwide. A.as B.for C.because D.since D B B C 题型二 选词填空 选词：because /for/since /as 1.____________ many people love natural music, Tan’s works sell fast. 2.He collects old instruments ________ he wants to hold a show. 3.—Why do you join the band? —________ I enjoy making music. Since/As because Because 题型二 选词填空 4.The new album sells quickly, ________ it mixes erhu and pop. 5.________ parents are welcome at the festival, we prepare chairs. 6.We replay the song daily, ________ it tells warm hometown stories. for Since/As for 题型三 句型转换 1.She learns violin. She wants to perform.（because 合并） 2.The song won prizes. It is amazing.（for 合并） 3.You sing well. You can take part in the competition.（since） She learns violin because she wants to perform. This song is amazing, for it won prizes. Since you sing well, you can take part in the competition. 题型三 句型转换 4.Mozart’s music calms students. Teachers play it in class.（as） 5.The artist creates music from rubbish. People praise him.（because） 6.We draw posters together. Drawing is our hobby.（for） As Mozart’s music calms students, teachers play it in class. People praise the artist because he creates music from rubbish. We draw posters together, for drawing is our hobby. 题型四 中英互译 1.As this piece uses bamboo, it has strong Chinese style.（中文） 2.我们期待这场音乐会，作曲者是谭盾。（英文，because） 3.He avoids rock music, for it is too noisy for him.（中文） 4.既然你擅长小提琴，音乐节你来表演。（英文，since） 这首曲子融入竹乐器，带有浓厚中国韵味。 We all look forward to this concert because its composer is Tan Dun. 他很少听摇滚乐，因为摇滚乐对他来说太吵。 Since you are good at playing the violin, you can perform at the music festival. 单元核心知识点复盘 1.because 语气最强，唯一可回答 why 问句 2.for 仅书面后置，主句后必须加逗号，不可句首 3.since/as 同义，表已知理由，前后位置灵活 4.从句前置主句前加逗号，for 末尾固定带逗号 5.直接因果用 because；事后推论补充用 for 记忆速记口诀 答句有 why，必用 because； for 居句尾，逗号不能废； since 和 as，理由众人知； 从句放开头，逗号在后支。 教学课件 Unit5 语法专项 ——because/for/since/as原因状语从句 Thank you for listening! 22 $