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1 ----“why did Lilei use a pencil”
---- his pen was broken 2. we have no money，we
can’t buy it 3. he has no car，he can’t
get theretudy hard．）除非你努力学习，否则你会失败。
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• you do more exercise，you will be healthy • He won’t be here he’s invited
• Maths is very easy to learn you understand the rules
Welcome to my class
民勤职专 李晓华
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辨别下列从句类型
1.I think he is right . 2.That is why he is late for school . 3.The boy who plays basketball is my brother . 4.This is the farm where I worked . 5.He didn’t go home before he finished his homework . 6.If it rains tomorrow, we will not go to the zoo .
1. I will call you as soon as I arrive in Beijing . 2. He had learned a little Chinese before he came
to China . 3. I will tell him everything when he comes back . 4. Don’t get off until the bus stops . 5. I have worked in this school since I graduated
factory
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2.条件状语从句
常用引导词： if unless as long as once
1. I will help you with your English if I ‘m
free .
2. Once you remember the words，English is
easy .
3. As long as you are happy， I will be happy .
5.Don’t leave the room you have finished the text
6.I’d like to go swimming the water is not too cold
• He sang happily he walked along the river
•
he got to the station，the train had left
• He had learned a little English he came to China
•
he finished middle school，he went to work in a
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状语从句是指句子用作状语时起副词作用的句 子。一般可分为八大类，分别表示为：
时间状语从句 条件状语从句 原因状语从句 结果状语从句 目的状语从句 让步状语从句 比较状语从句 地点状语从句
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1． 时间状语从句
常用引导词：__w_he_n__,_as_,_w_h_il_e_,_as__s_oo_n_a_s , __w_hi.l_e _b_e_fo_r,e___a_fte_r__,__si_n_ce_,__til_l _,__u_n_til__.
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3、 原因状语从句
常用引导词：__b_e_c_a_u_s_e_,__s_i_n_c_e___,__a_s__
1.He didn’t go to school because he was ill 2.Since you can’t answer the question I’ll ask someone else 3.As he is no car ,he can’t get there easily
from Beijing University .
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when 主句和从句动作同时发生 before 之前 after 之后 as 并行发生，不分先后 While 强调主句所表示的动作持续于while所指的整个时间内
•
John was watching TV，his wife was cooking
4. Unless you put on a coat，you may catch a
cold .
要点：引导条件状语从句的连词有if（如果）、unless（除非）等，
unless在意义上相当于if．．．not。条件状语从句也像时间状语从
句一样，如果主句用将来时，从句要用现在时代替将来时。如：
You will fail____ you study hard．（＝You will fail if you don't
1.I haven’t heard from him American
he went to
2.I will tell him the news
he comes back
3.He will not go to the cinema
he is very busy
4
it rains tomorrow，we will not go to the zoo
比较: because常回答why引导的疑问句，该从句一般位于主句后； since比as正式，两者不回答why引导的问句，而且其从句一般放在 句首。如： 1.—Why can't I go？为什么我不能去？ — ______ you're too young．因为你年纪太小了。 2.___you are not feeling well，you'd better stay at home． 既然你不太舒服，还是留在家里的好。