标签：八年级英语教学设计大全,http://www.lexue88.com
八年级英语下册Unit 3 What were you doing when the UFO arrived? 同步语法解析,
在平时训练中，同学们的易错点在“when”与“while”的选择运用上，经常把它们两个所引导的时间状语从句的主从句的时态搞错，再就是把一般过去时与过去进行时混淆，如以下所示：
(1)The boy with his parents _____when the earthquake rocked their city.
A. were sleeping B. is asleep C. was sleeping D. are asleep
本题易错点之一在于介词“with”的用法掌握较差。A with B的谓语动词应与A 一致，为单数形式；易错点之二在于没有遵循“when”引导的时间状语从句的主句用过去进行时从句用一般过去时。因此正确答案为C。
(2) The policewoman asked the man ___ at 9:00 o'clock last night.
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A. what is he doing B. what he is doing
C. what was he doing D. what he was doing
根据题意同学们都能够知道用过去进行时，但本题易错点在从句为特殊疑问句时，引导词为特殊疑问词，其后应该是陈述句的语序，绝大多数学生都忽略了这一点，致使失分严重。所以正确答案应为D。
(3) When you_______ (konck) at the door yesterday, I_________ (do) some washing.
本题关键要弄清“when”与“while”后所跟的动词。“when”既可接时间点也可接时间段，“when”引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词，所以主句用过去进行时，从句应用一般过去时；“when”从句中的动作既可以与主句的动作同时发生，又可在主句的动作之前或之后发生。而“while”接一段时间，从句中的动作必须是延续性动词，从句中的动作与主句中的动作同时发生，主从句都用过去进行时的多。所以正确答案为：knocked; was doing.
附：【用法点拨】练习答案
句型转换：
(1)What were; doing (2)was doing
用“when”与“while”完成句子：
(1) while (2) while (3) when (4) while (5) when
单项选择：
(1) B (2) C (3) D (4) A
汉译英：
(1) were swimming (2) was listening (3) was having breakfast
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，八年级英语下册Unit 3 What were you doing when the UFO arrived? 同步语法解析
