英语语法-条件状语从句

3. To learn the conjunctions that Conditional Adverbial Clause obtains
If you're happy ，what will you do ?
If I am happy, I will smile.
一、条件状语从句的定义
if “如果，假如”， 它引导的句子表示某事发生 所需要的条件，即“在……条件下，某事才能发 生,”在句子中充当状语，因此称之为条件状语从 句。
从句
主句
If you‘re happy, what will you do ?
wk.baidu.com
If I am happy, I will smile.
总结:有 if 引导的句子，叫_从__句__，另一句子则 为_主__句__
活学活用：用所给词造句 ill， see a doctor
If I am ill, I will see a doctor. enough money, travel around the world
Please dress him if he _fe_e_l_s__(feel) cold.
总结②：在if引导的条件状语从句中，主句用祈 使句，从句用现在时，简称_“_主__祈__从__现__”
We may become lazy if we _h_a_v_e (have) robots do everything for us.
If I have enough money, I will travel around the world
从
If I am ill, I will see a doctor.
前 主
I will see a doctor if I am ill.
后
有 ， 从
If I have enough money, I will travel around the world
Conditional Adverbial Clause (条件状语从句）
课堂教学目标：
1.To master what Conditional Adverbial Clause is
2. To know about the questions that we should pay attention to
If it rains tomorrow, If I aamm hungry, I will eat
I will watch TV at some food.
home.
总结①：在if引导的条件状语从句中，主句用将 来时，从句用现在时，简称“__主__将__从__现_”
Please call me if she _p_a_s_se_s__ (pass) the exam.
1、unless引导的条件句，表示强烈的否定。 翻译为“除非…”。“非……不可。”
你将会失败除非你更努力。（你不努力就会失败的。） You will fail unless you work harder .
你别来，除非我叫你。（我不叫你就别来。） Don’t come unless I call you .
3. as long as 只要…就…，表示一种前提条件 留得生命在,不怕没希望.
As long as there is life， there is hope.
他可以做任何事情只要它有趣。 He will do anything as long as it is interesting.
4. on condition(that)只有在……条件下
后
主
I will travel around the world if I
前 have enough money.
无
总结：从句在前，主句在后，__有___ 逗号隔开；
主句在前，从句在后，_没__有__逗号隔开。
二、学习条件状语从句要注意的问题
活学活用：
rain, watch TV
hungry, eat some food
2、in case 万一
带上帽子，万一太阳很大。（倘若太阳很利害，你就把帽子戴上。） Take a hat with you in case the sun is very hot.
把电话号码写下来万一忘了。 Write the telephone number down in case you forget.
Summary：
1.条件状语从句的定义 “主将从现”
2.条件状语从句注意问题
“主祈从现” “主情从现”
3.其他的引导条件状语从句的引导词
unless，in case, as/so long as， on condition，
provided, suppose
That’s all！ Thank you.
I can tell you the truth on condition that you promise to keep a secret.
5. supposing conj.如果，假如,表示一种假 设的条件，常位于句首
Supposing it rains,shall we continue the sports meeting?
(wear) his coat.
4. He _w_il_l _n_o_t_le_a_v_e__ (not leave) unless it is fine next day.
拓展 三、条件状语从句的其他引导词
unless，in case, as/so long as，
on condition，provided, suppose,
1. Don’t promise anything _u_n_le_s_s_ you are one hundred percent sure.
2. _If_ he thought he could escape
attention by sitting at the back, he was wrong. 3. _O_n_c_e__ you lose heart, you will fail in the exam. 4. If he _d_o_e_sn_’_t_c_o_m_e_(not come)on time, we will go without him. 5. If you help me, I _w_i_ll_f_in_i_sh_(finish) my task on time.
You must stop if the traffic light _i_s__ (be) red.
总结③：在if引导的条件状语从句中，主语含有 can, must, may,
should等情态动词时，从句用现在时，简称“__主__情__从__现”
趁热打铁：
1.If he _a_r_r_iv_e_s(arrive) tomorrow, I will be waiting for him at the airport. 2.He can go home if he _fi_n_is_h_es (finish) his homework. 3. If it is cold tomorrow, he _w_i_ll_w_e_a_r