Section A-2

条件状语从句
一、概念：条件状语从句是用来说明主句动作发生的条件，即某一件 事情（从句中的动作）实现之后，其他事情（主句中的动作）方能发生。 也就是说“在......条件下某事才能发生”。
二、引导词： 1. if 如果 2. unless 如果不;除非，相当于if...not e.g. Unless you go to the party, I won't have a good time.
杰克想知道他是否是一名教师。
（3）I don't care if he is tall.
我不在他是否长得高。
Exercise
巩固训练
Translate the sentences.
1. I think I’ll take the bus to the party. If you do, you’ll be late. 我想我将乘公共汽车去参加聚会。 如果你那样做的话，你将会迟到。
如果你觉得那个大房子漂亮的话, 我们就买它。
8.Do you know if he will come to play basketball tomorrow? 你知道明天他是否会来打篮球吗？
9.We will leave for America if it doesn’t rain tomorrow .
A: I think I will/ won't ... B: If ..., ...will/ won't ... C: If ..., ... will/ won't ...
Conclusion 总结
检测时间
用括号内所给单词的适当形式填空。 1．If it rains tomorrow，I will stay (stay) at home. 2．He will take a trip to Beijing if he isn't (be not)
Unit 10 If you go to the party, you’ll
have a good time!
Read the sentences
I think I’ll take the bus to the party. If you do, you’ll be late.
I think I’ll stay at home. If you do, you’ll be sorry.
Watch and conclude the use of IF
观察总结if用法
I think I’ll take the bus to the party. If you do, you’ll be late.
I think I’ll stay at home. If you do, you’ll be sorry.
5. If I go to Guilin, I will have a good time. 如果我去桂林，我将会过得愉快。
6. I wonder if he likes apples. 我想知道他是否喜欢苹果。
7. We will buy that big house if you think it is beautiful.
What will happen if they have the party today? If they have it today, half the class won’t come.
Should we ask people to bring food? If we ask people to bring food, they’ll just bring potato chips and chocolate.
Extension 拓展延伸
if还有其他用法吗？
if还可以引导宾语从句，意为“是否”，在引导宾语从句时,
时态需根据语境确定。例：
（1）I don't know if it will rain tomorrow.
我不知道明天是否会下雨。
（2）Jack wants to know if he is a teacher.
Make sentences. 模仿例句造句。
e.g.Baidu NhomakorabeaA: I think I will go to the movies tonight. B: If I go to the movies, I won't finish my homework. C: If I don't finish my homework, my parents will be angry.
If you don't finish your homework, you mother won't be happy.
If you finish your homework, you mother will be happy.
在正确的答案下打勾。
√ 1. Daina ( will go/go/goes) to Europe if she √ (will pass/pass/passes) the exams .
it snows this afternoon.
单项选择。
(A )6.—Do you know when he will come back
tomorrow? —Sorry，I don't know.When he ________ back，I'll tell you.
busy next week. 3．Please tell Li Jun about it if he comes (come) back. 4．If you don't wear your school uniform to the party，
the teachers won't let (not let) you in. 5．She won't go (not go) shopping with her parents if
四、时态： 1.如果主句是一般将来时, 从句要用一般现在时, 这在英语里被称为 “主将从现”原则。 2.如果主句是祈使句或含情态动词may,can,must等时，从句也用一般现在时。
例如： You must go to the doctor if you are ill. 如果你生病了，你必须去看医生。 If you want to go outside, wear warm clothes. 如果你想去外面，穿上暖和的衣服。
please?
3b Complete the sentences using your own ideas.（用你自己的想法完成句子）
1.If I get up late tomorrow, __I_w__il_l _m_i_s_s_t_h_e_s_c_h_o_o_l_b_u_s______ 2.If I don’t finish my homework, _m__y__te_a_c_h_e_r_w__il_l_b_e_a_n__g_ry_______ 3.If I don’t get enough exercise, __I_w_o_n__’t_b__e_s_tr_o_n_g_____________ 4.I will not have enough time to study if __I_p_l_a_y_c_o_m__p_u_t_e_r_g_a_m__es__a_ll_t_h_e_d_ay. 5.I will not make any friends if __I_a_l_w_a_y_s_m__a_k_e__th_e_m__s_a_d_.______
Dear Su Mei,
I don’t _k_n_o_w__ (know) what to __d_o___ (do) about going to
Mike’s birthday party tomorrow night. My parents
_t_h_in__k_(think) I should study for my English exam next week. If I__g__o__(go) to the party, they _w__il_l _b_e__(be) upset. Mike __te_l_ls__(tell) us to wear nice clothes, but I don’t _h_a_v_e__(have) any. If I_w_e__a_r(wear) jeans, I _w_i_ll_l_o_o__k(look) the worst. Also, I’m not sure how to _g__o_(go) to the party. If I _w_a__lk__(walk), it _w__il_l _t_a_k_e_ (take) me too long. If I _ta__k_e_ (take) a taxi, it __w_i_ll_b__e__ (be) too expensive. Can you give me some advice
如果明天不下雨, 我们就去美国。 10.Do you know if she is a singer?
你知道她是否是一个歌手吗？ 11.Unless you finish your homework, you mother won't be happy.
除非你完成作业，否则你母亲不会开心的。 12.将11题改写成同义句
√ 4. Unless it (will/does// is) rainy, we √ (will take/ take/takes) a walk outside.
√ 5. Don't wait for me if I (am/ will be) late.
3a Fill in the blanks with the correct forms of the verbs in brackets.（用所给词的正确形式填空）
4. Should we ask people to bring food? If we ask people to bring food, they’ll just bring potato chips and chocolate. 我们应该让人们带食物来吗？ 如果我们让人们带食物来，他们只会带炸薯条和 巧克力。
√ 2. (Will / Do/ Does) he visit the museum if he √ (won't / don't/ doesn't) get tired?
√ 3. If there (will be/ are/is) a car accident(车祸), they √ (will call/call/calls) 110 for help at once.
What will happen if they have the party today? If they have it today, half the class won’t come.
Should we ask people to bring food? If we ask people to bring food, they’ll just bring potato chips and chocolate.
2. I think I’ll stay at home. If you do, you’ll be sorry. 我想我将待在家里。 如果你那样做的话，你将会很遗憾。
3. What will happen if they have the party today? If they have it today, half the class won’t come. 如果我们今天举行聚会，将会发生什么？ 如果他们今天举行聚会，一半的同学将不会来。
除非你参加这次聚会，否则我不会过得愉快。 If you don't go to the party, I won't have a good time. 如果你不参加这次聚会，我不会过得愉快。
条件状语从句
三、位置：条件状语从句既可放在主句之前也可放在主句之后。 当从句置于主句之前时，常用逗号与主句隔开。