came back.（leave是个短暂性动词）
② till/until 在肯定句中表示“直到为止” 主 句中动词用延续性动词
e.g. I waited till / until he arrived. (wait是一个延续性动词）
practice:
1. I will go to bed as soon as I __C__my homework. A. will finish B.finishing C. finish
e.g. I won’t go to bed until I finish my homework.
注意
时间壮语从句中若用一般将来时，从句
则用一般现在时表示将来，即遵循“主将 从现”的原则。
(3)not...until的同义句替换。 ① not…until在否定句中表示“直到……才” 主句中的动词常用终止性动词, 这时 till/until可用before替换 e.g. I didn’t leave until/till/before she
e.g. 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
e.g. I will write to you as soon as I get to Beijing.
e.g. I will tell him when he comes back.
例句. 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. 例句. 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.
1.时间状语从句 (1)引导词：when, while, as, before, after,
as soon as, until/till, since.
e.g. Mother was cooking dinner when I reached home.( when “当……的时候”）
e.g. While the girl was shopping, the UFO landed. （ While “当……的时候”）
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。
e.g. If you go to the party, you will
have a good time.
e.g. You will have a good time If you
go to the party.
➢ 中考考点设置
e.g. If it doesn’t rain, we will go for a walk. unless是从属连词，它引导条件壮语从句，译作 “除非……否则的话” e.g. You will be late for class unless you start
right now.除非你现在出发否则的话年上学就会迟到的。 e.g. You will not succeed unless you work hard. (2)来。) (3)if...not与unless(=if…not…) 及or的同义句转换。
2. She w__il_l _g_o_s_h_o__p_p_in_g__next Sunday if she_w_o_n_’_t_b_e_ busy.
3.Please hurry up, or you will miss the train. =_I_f _youd_o_n_’t hurry up, you willm__is_s the train =U__n_le_ss you hurry up, you will miss the train.
小结:“祈使句+or+一般将来时的陈述句”结构中，
Or表示转折，译作“否则，不然的话” 相当于一个否定的条件状语从句。 相当于If you don’t(can’t)…, you will…
practice:
1. If you _g_o__ to the party, you_w__il_l have a good time.
专题句型
状语从句
➢ 考点揭密 ➢ 中考考点设置 ➢ 典型例题解析 ➢ 课时训练
➢ 考点揭密
在复合句中修饰主句中的动词、形容词或副词或 句子，起状语作用的从句。由从属连词引导，从属连 词在从句中不充当句子成分。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。
4. I will not watch TV until I finish my homework .
=I will not watch TV b__ef_o_r_e I finish My homework .
2.My sister w__a_s_r_e_a_d_in__g_(read)her book in the classroom when her teacher came in.
3.I my_w_a_s__d_o_in_g__ (do)homework while my parentsw__e_re__w_a_t_c_h_in_g_(watch) TV last night.
2.条件状语从句
(1)引导词：if,unless.
e.g. If I am free, I will call you.
e.g. As he was reading, he was listening to the radio.（As “一边……一边”）
e.g. Don’t close the window before you go to bed.(before 在……之前）
e.g. After I had done my homework, I went to bed.