Unit 8 Then and now 语法重点讲解（专项训练）-2026-2027学年译林版（三起）英语六年级上册

**基本信息** 以“定义-动词对比-应用-避错”为逻辑链，系统构建一般过去时与一般现在时今昔对比语法体系，通过多题型强化时态准确运用与对比思维，提升语言能力与思维品质。 **专项设计** |模块|题量/典例|方法提炼|知识逻辑| |----|-----------|----------|----------| |语法小结|6点核心（含情态动词/Be动词对比、写作句型）|时态定义+标志词；could/can+原形结构；then/now时态判定规则|从概念（then/now定义）到规则（动词形式变化），再到应用（写作句型）与避错| |专项训练|8类题型（填空/单选/改错等）|动词形式填空技巧；句型转换步骤；易错点（could后接原形等）警示|通过不同题型强化时态区分，实现从单一知识点到综合应用的迁移|

【译林版（三起）六年级上册】 Unit 8 Then and now 语法重点讲解及练习 单元语法小结 核心语法：一般过去时 VS 一般现在时（今昔对比） 1. 两大时态定义 （1）一般过去时（then 过去） 含义：描述过去某个时间的动作、状态、能力，侧重“以前如此，现在大多已改变”。 标志词：then, before, ago, in the past, last...（last year/last month） （2）一般现在时（now 现在） 含义：描述当下的能力、状态、日常习惯，侧重“现在的常态”。 标志词：now, every day, usually, often, at present 2. 单元重点：情态动词今昔对比 ---过去能力：could + 动词原形（can的过去式，无人称变化） 肯定：主语 + could + 动原 否定：主语 + couldn’t + 动原 疑问：Could + 主语 + 动原…? 例：I could not swim before. 我以前不会游泳。 ---现在能力：can + 动词原形 肯定：主语 + can + 动原 否定：主语 + can’t + 动原 疑问：Can + 主语 + 动原…? 例：Now I can swim very well. 现在我游泳很棒。 3. 实义动词今昔变化规则 （1）现在：主语三单动词变三单（+s/es），非三单用原形 （2）过去：所有人称统一用动词过去式，无人称变化 规则变化：直接加ed、e结尾加d、辅y变i加ed 单元常见不规则过去式： can—could, do—did, go—went, have—had, is/am—was, are—were 4. Be动词今昔对比 现在：am / is / are 过去：was（单数I/he/she/it） / were（复数we/you/they） 口诀：过去单数was，复数were 5. 常用写作句型 ---...before, but now... （过去……，但是现在……） ---Sb could/couldn’t do sth before, but now sb can do sth. ---Sb did sth in the past, but now sb does sth. 6. 易错点 ---then/before 出现，一律用过去式；now 出现，一律用现在式 ---could/can 后永远加动词原形，禁止加ing/s/ed ---could 是can过去式，无人称变化，不用coulds ---今昔对比句，前后时态必须区分，不能混用 专项训练 一、用can/could/动词正确形式填空 1. I ________ (can not) ride bikes before, but now I ________ (ride) well. 2. My brother ________ (play) football very well now, but he ________ (can) not play it two years ago. 3. Five years ago, there ________ (be) no tall buildings here. 4. Now my sister ________ (study) hard every day. 5. People ________ (not use) mobile phones many years ago. 二、单项选择 ( ) 1. I ________ draw pictures when I was five, but now I can draw very well. A. can’t B. couldn’t C. didn’t ( ) 2. My father ________ to work by bike every day now. A. go B. goes C. went ( ) 3. There ________ a small park here before. A. was B. is C. were ( ) 4. ________ you swim in the past? A. Can B. Could C. Do ( ) 5. She ________ short before, but now she is tall. A. is B. was C. were 三、用所给词的适当形式填空 1. He ________ (watch) TV every night now. 2. They ________ (walk) to school yesterday. 3. My mother ________ (can) cook food when she was young. 4. Now we ________ (learn) many new things at school. 5. I ________ (not play) computer games before. 四、句型转换 1. I could fly kites before.（改为否定句） __________________________________ 2. She can sing songs now.（改为一般疑问句） __________________________________ 3. He was thin before.（对划线部分提问） __________________________________ 4. Could they swim before?（肯定回答） __________________________________ 5. There were some trees here before.（改为否定句） __________________________________ 五、找出错误并改正 1. I can swim very well before. ________________________ 2. Could you played basketball before? ________________________ 3. He go to school on foot now. ________________________ 4. There is no houses here before. ________________________ 5. She couldn’t speaks English before. ________________________ 六、根据中文提示完成句子 1. 我以前不会写字，但是现在我会了。 I ________ ________ words before, but now I ________. 2. 五年前这里没有超市。 There ________ no supermarkets here ________ ________ ________. 3. 他现在每天骑自行车上学。 He ________ to school by bike ________ ________ now. 4. 以前人们用书信交流。 People ________ letters to communicate before. 5. 我的弟弟以前很矮。 My brother ________ very short ________. 七、连词成句 1. before, I, swim, couldn’t ________________________ 2. now, can, I, fast, run ________________________ 3. was, here, before, a, river, there ________________________ 4. now, studies, hard, she ________________________ 5. could, not, before, write, they ________________________ 八、短文时态填空 Look at my changes. Three years ago, I ________ (be) short. I ________ (can) not run fast. I ________ (study) little. But now I ________ (be) tall and strong. I ________ (run) fast every day and I study very hard. 【参考答案】 一、 1. couldn’t; ride 2. plays; could 3. were 4. studies 5. didn’t use 二、 1.B 2.B 3.A 4.B 5.B 三、 1. watches 2. walked 3. could 4. learn 5. didn’t play 四、 1. I couldn’t fly kites before. 2. Can she sing songs now? 3. What was he like before? 4. Yes, they could. 5. There were not any trees here before. 五、 1. can → could 2. played → play 3. go → goes 4. is → were 5. speaks → speak 六、 1. couldn’t write; can 2. were; five years ago 3. goes; every day 4. wrote 5. was; before 七、 1. I couldn’t swim before. 2. I can run fast now. 3. There was a river here before. 4. She studies hard now. 5. They could not write before. 八、 was; could; studied; am; run 学科网（北京）股份有限公司 $