Unit 10 since和fo r现在完成时区别+练习2023-2024学年人教版八年级英语下册

八年级英语（下）现在完成时 Unit 10 I’ve had this bike for three years. 含有since和for的现在完成时态 since和for是现在完成时当中常见的标志词。since“自从……”，for“持续了……”。since用来说明动作的开始时间，for用来说明动作延续的时间长度 考点1 since和for是现在完成时的重要标志 （ ）Something ________ in our hometown since 2014. Now it ________ very modern. A. is changed; is looked B. has changed; looks C. changed; looks 考点2 since和for的用法 （1）since的用法 since+过去的时间点。如：年、月、日、几点等 ☞since 1990 自从1990年起 ☞since 5 o’clock 自从五点起 since+ 时间段+ ago ☞since 3 months ago 自从三个月以前 since+ 一般过去时的从句 ☞since you left home 自从你离开家以后 ①My grandparents ________ in that city since 2008. A. will live　　　　 B. live C. have lived D. were living ②I'm looking after Tom today. He's been in my house ________ 8：00 this morning. A. at B. since C. for D. till （2）since的一个固定句式“It is＋时间段＋since＋一般过去时的从句”。 It is five years since I came here. 我来这儿5年了。 （3）for的用法：for＋时间段 （ ）—Did you see Tom yesterday? —No，I ________ him for a long time. A. didn't see　　　　　 B. hasn't seen C. saw D. haven't seen （4）在现在完成时当中，若对since和for引导的时间状语进行提问，都可以用how long来提问。 （ ）—________ have you lived in Lanzhou? —Since my parents found jobs here. A. How long　　　 B. How far C. How soon D. How old （5）since和for的句式转换： since＋时间段＋ago＝for＋时间段 They haven't changed since twenty years ago. ＝They haven't changed for twenty years. 他们已经二十年没有改变了。 考点3 延续性动词、短暂性动词与since, for 延续性动词表示能够延续的动作。短暂性动词表示不能延续的动作，这种动作发生后立即结束。 (1) 若现在完成时的句子中含表示时间段的时间状语(如含since/for引导的时间状语)，则谓语只能使用延续性动词。 （ ）—The boy misses his parents very much.—So he does. They ________ the hometown for nearly two years. A. have left　　　　 B. will leave C. have been away from (2) 短暂性动词可以转化为延续性动词 ①直接换成延续性动词　 buy买→have有　 borrow借→keep保留　 put on穿上→wear穿着 come/go/become来/去/变成→be在/是 ②转换成be＋名词 join the army参军→be a soldier当兵 join the Party 入党→be a Party member成为一名党员 go to school去上学→be a student成为一名学生 ③转换成be＋形容词/副词 die死亡→be dead死了 finish结束→be over结束 begin开始→be on 在上映/已开始 leave离开→be away远离的 fall as