4.I _w_a_s__d_o_in_g__ (do) my homework while my parentsw__e_re__w_a_t_c_h_in_g_(watch) TV last night.
条件状语从句
b.（1）引导条件状语从句的词有： if (如果), unless (除非)==if …not
eg：I was doing my homework when my
mother came back.
= While I was doing my homework , my
mother came back .
1. Mother was cooking dinner when I reached home.
( when “当……的时候”）
2. While the girl was shopping, the UFO landed. （ While “当……的时候”）
3. As he was reading, he listened to the radio.（As “一边……一边”）
4. Don’t close the window before you go to bed.(before 在……之前）
分别引导时间、条 件、原因、结果、 目的、让步状语从 句的连词
时间状语从句
a. 引导时间状语从句的词有：
when（当…时候)，
while（当…时候），
after 在…之后），
before（在…之前），
as soon as（一…就） ， since（自从）,
as（一边……一边……）， till/until（直到……才）
8. I will tell him when he comes back.
9. I won’t go to bed until I finish my homework.
注意 : 若主句用一般将来时，时间状语从 句则用一般现在时表示将来，即遵循 “主将从现”的原则。
Practice:
1. She will go to bed as soon as she __C__her homework.
go to the party.
状语从句可分为时间、原因、目的、结果、条件、 比较、地点、让步、方式等九类。
复习状语从句必须要关注和掌握的两 个要点：
1、 要和连词的意义联系起来
2、要和时态结合起来，尤其是时间 和条件状语从句，状语从句要用一般 将来时表示将来（主句用某种时态表 将来时）。
要点一：ห้องสมุดไป่ตู้
A. will finish B.finishing C. finishes
2. I will not watch TV until I finish my homework .
=I will not watch TV b_e_f_o_r_e I finish My homework .
3.My sister w__a_s_r_e_a_d_in__g_(read)her book in the classroom when her teacher came in.
Don’t leave the building unless I tell you to.
If I am free, I will call you. If it doesn’t rain, we will go for a walk. You will be late for class unless you start
right now.
除非你现在出发否则的话你上学就会迟到的。
(2)“祈使句 + and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句：
Hurry up, or you’ll be late. =If you don’t hurry up, you’ll be late. Study hard， and you will pass the exam. =If you study hard, you will pass the exam.
2. Study harder,or you will fail the exam. =If you don’t study harder, you will fail the exam. =Unless you study harder, you will fail the exam.
5. After I did/had done my homework, I went to bed.
6. The Greens has lived here since they came to China.
(since 引导的时间壮语从句若用一般过去时， 主句则用现在完成时
7. I will write to you as soon as I get to Beijing.
eg：If you don't get up early , you won’t be able to catch the early bus.
= Unless you get up early , you won’t be able to catch the early bus .
What shall we do if it snows tomorrow?
if...not与unless(=if…not…) 及or的同义句转换。
1. Hurry up, or you will be late. =If you don’t hurry up, you will be late. =Unless you hurry up, you will be late.
➢ 考点揭密
在复合句中修饰主句中的动词、形容词或副词， 作状语的从句叫状语从句。状语从句可置主语之前， 也可置主语之后。前置时，从句后用逗号与主句分开； 后置时，与主句之间无标点符号。
e.g. If you go to the party, you will
have a good time. e.g. You will have a good time if you