Look and say
If I’m hungry,
I will_e_a_t_s_o_m__e__fo_o_d__.
If I’m tired,
I will__h_a_v_e_a__r_e_s_t __.
Look and say
If I’m ill, _I_w_i_l_l _s_e_e__a_d_o__c_to__r_.
如果你愿意等一会的话，我去告诉我妈妈你来了。
试比较下列句子： If you see him tomorrow ,give him this book . 如果你明天去看他，给他这本书。 If you will see him tomorrow ,give him this book . 如果你明天愿意去看他，给他这本书。
If it is sunny this weekend, I _w__o_n_’_t _w_a_t_c_h_t_e_le_v_i_s_io_n__.
practice
If you are free this weekend, what will you do ?
sleep
If I am free ,… watch TV
5.If you __te_l_l __(tell) them, they __w_o_n_’_t_b__e_li_e_ve_ (not,believe) you. 6 I __w_i_ll_s_t_a_y_(stay) at home,If it ___ra_i_n_s____( rain). 7.If it _d__o_e_s_n_’t_r_a_i_n_(not,rain) ,I __w__il_l _g_o__( go) out. 8. we _w__il_l _p_la_y___(play) football, If it is s_u__n_n_y____(sun) . 9.If she _b_e_c_o_m__e_s__(become) a star ,her parents __w_o_n_’_t_s_e_n__d_
_I’_ll_p_l_a_y_b_a_s_k_e_t_b_a_ll_.
If it is sunny this weekend, what will you do ?
If it is sunny this weekend, I __w_i_ll_p_l_a_y__ football with my classmates.
（C ）2. Work hard if you ______ to get a good mark.
A. wanted B. wanting C. want D. will want
（A ）3. --I want to know if you______ to the party tomorrow.
果不早点起床，上学就会迟到。
2. If I play games on it , it will go wrong .
如果我用它玩游戏，它就会坏掉。
3. If you finish the homework， you can go home． 如果你作业做完了就可以回家了。
4. If you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。 5.If you heat ice it turns to water. (也可用will turn) 如果把冰加热，它就会化成水。
if条件状语从句要用一般现在时。
What will you do if you’re happy?
❖ If I’m happy, I will _cl_a_p_m__y_h_a_n_d_s_. ❖ If I’m happy, I will _s_ta_m__p_m__y_f_e_e_t . ❖ If I’m happy, I will _n_o_d_m__y_h_e_a_d__. ❖ If I’m happy, I will __w_i_n_k_m__y__e_y_e_s_.
3. 如果主句是祈使句，从句同样要用一般现在时。
Don’t go and play football if you don’t finish your homework.
Please call me if he comes next Sunday.
4.表示假设，表示将会发生和可能发生的事，
或进行提醒警告。 If +句子（一般现在时），+主句（主语will/may/can) +动词）
If you finish your homework , you can go out and play. If I have enough money next year , I will go to travel .
5. 下列从句中的will不是将来时助动词，而是情态动词。 翻译为“愿意”。 If you will excuse me,I really must go to bed . 如果你能原谅我的话，我真的要睡觉了。 If you will wait a minute ,I’ll go and tell my mother that you are here .
If I’m late, _I _w_i_ll__s_a_y_s__o_r_ry____.
If it rains tomorrow, I_w_i_l_l _w_a_t_c_h__T_V__a_t_h__o_m__e. I won’t__p_la__y_b_a__s_k_e_t_b_a_ll_.
If it _d_o_e_s__n_’t__ra_i_n__ tomorrow,
If条件句：条件句用于陈述语气，表示假设的情况可能发生，
其中 if 是“如果”的意思。
构 成
条件从句
主句
时 态
If＋一般现在时 主语＋shall/will+动词原形
例 句
If he comes,
he will take us to the zoo.
用法：
1. 如果主句是一般将来时，从句则用一般现在时。
3. He wondered ______ to stay here the next week.
与to do 不定式连用只能用whether 4. ____ he will come is not decided.
作主语只能用whether
If 引导条件状语从句
Complete the sentences with the correct form of the words.
If it rains（从句）， I will stay at home. I’ll go with you if you don’t want to go alone（从句）.
2.如果主句含有must, may, can 等情态动词，从句也要用
一般现在时。 If you drive too fast, you may have an accident. You must stop if the traffic is red.
3. If you boil water, it becomes steam.
4. If you feel tired, you must have a rest. 条件状语从句
语法1：if作为宾语从句 的引导词，引导宾语从 句。（是否）
语法2：if（如果）引 导的条件状语从句
❀ if 用于宾语从句中
(not,send) her away 10.He w__il_l _w_a_t_c_h_(watch) TV ,if he ___is___(be) free.
exercises
（B ）1. Be careful, if you______ want to make mistakes.
A. won’t B. don’t C. didn’t D. not
if条件句歌诀
❖ if条件句不一般,几个要点记心间。 ❖ 条件句放在前,逗号要放句中间。 ❖ 条件句表可能,主句多用将来时； ❖ 条件句表事实,主句常用现在时。 ❖ if条件句有特点,现在时把将来替； ❖ 这个规则要牢记!
e.g.
1.If you don’t get up early, you will be late for school .你如
If从句 条件状语从句
What will I do if it is sunny this weekend?
Part1:If 的用法
1.I want to know if he will go to park with us. 宾语从句 2. We will have a picnic if it doesn’t rain.
If it is sunny this weekend, I__________.
If it is sunny this weekend, what won’t you do ?
If it is sunny this weekend, I _W__o_n_’_t _s_ta_y__a_t_h_o_m__e____.
1.If he__d_o_e_s_n_’t_d__o__ (not, do it ), I___w_i_ll_d_o____(do) it. 2.If you _a_r_e_ (be) late for school ,my teacher _w__il_l _b_e__(be) angry.
3 If she__w__in_s___ (win) the prize ,we _w_i_ll_b__e_(be) happy. 4.If I __d_o_n_’t_e_a_t_ (not,eat )so much ,I _w__il_l _g_e_t__(get) thi一般 whether 改为陈述句