在线学英语

初中英语八年级下册核心考点过去时态的since从句


  过去时是初二英语下册要学习的一个时态,也是初二下册比较重要的一个知识点。同时也是中考必考的一个知识点,所以大家要引起注意,努力学习。多读多记,比较记忆,学会区分。
英语学习
  记住since的四种用法:
  1.since +过去一个时间点。
  例如:
  I have been here since 1992. 1992年起,我一直在这儿。
  2. since +一段时间+ ago.
  例如:
  We have been here since five months ago.我们在这儿,已经有五个月了。
  3. since +从句。
  since时间从句中,应理解为“自从该动作结束以来”
  如:
  Great changes have taken place here since he left. 自从他离开以来这里发生了巨大的变化。
  Great changes have taken place in our hometown since you left. 你走后,咱们的家乡发生了巨大的变化。
  *如果要表示从句的动作或状态延续至今,该动词需用现在完成时,有时也可以用一般过去时,但这时需要在since前加ever,强调与现在的联系
  如:
  I've known her since I have lived here(或ever since I lived here /#since I came here).自从我住到这儿以来我就认识她。(完成时)
  I haven't heard from him since he lived (或was) in Beijing.自从他离开北京,我没有收到过他的来信。(过去时)
  注意:从句中使用延续性动词时,常容易误解
  如:
  How long is it since you smoked?你戒烟多久了(或你多长时间没抽烟了)?
  4. It is +一段时间+ since从句。
  例如:
  ①lt is three years since the old man died.那位老人去世已有3年了。
  ②It is five years since I joined the army.我参军已有五年了。
  注意:
  for后面接时间段而since后面接时间点。因为Since 用来说明动作起始时间,for用来说明动作延续时间长度。
  用since和for的填空练习
  1. ______ five years
  2._______ five years ago
  3. _______ last month
  4.______ 1992
  5._______ yesterday
  6. _______ 6 o’clock
  7. ______ 5 hours
  8._______ an two ago
  9. _______they were children
  10. _____ lunch time
  11.______ he left there
  12. SHe has lived in Nanjing ________ the year before last.
  13. I’ve known her __________ we were children.
  14. Our teacher has studied English _______ two years.
  15. He has been away from the city _________ about nineyears.
  16. It’s about five years __________ he left the city.
  答案:1、for 2、since 3、since 4、since 5、since 6、since 7、for 8、since 9、since 10、since 11、since 12、since 13、since 14、for 15、for 16、since


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