广州(上海)牛津英语八年级下册Unit7 Language

f.it breaks.
g.it becomes steam.
e 8. If you do not give plants water, h.it floats.
A2
1. If you _____________________ water. (ice / heat ice, it turns into turns / heat / it / into) bursts if you stick a pin into 2. A balloon ___________________________it.
2. 当if引导的从句放在主句前时，____ 用 （用/不用）逗号隔开两个句子（例1、3）； 当主句在前时，则____ （用/不用）逗号（例 不用 2、4）。 3. 记记这个顺口溜吧！ “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。”
4. You are not tired. Let’s go for a walk.
If you are not tired, let’s go for a walk. 5. We will go climbing tomorrow. It won’t rain.
If it doesn’t rain tomorrow, we will go climbing.
if引导的条件状语从句
观察下列句子，总结if引导的条件状语从句的用 法。 【例句】 1. If you stand in the rain, you get wet. 2. You get wet if you stand in the rain. 3. If it doesn’t rain tomorrow, I will plant some flowers in my garden. 4. I will plant some flowers in my garden if it doesn’t rain tomorrow.
boil If you _____ water, it _____ _____ steam. turns into
Possible action d 2. If you cool water, g 3. If you boil water, a 4. If you heat metal, h 5. If you put wood into water,
Result b.it dies. c.they grow. d.it turns into ice. e.they die.
b 1. If you take a fish out of water, a.it melts
c 6. If you plant seeds in soil,
f 7. If you drop a glass,
二、根据中文意思完成句子。
1. 如果你不运动，你会变胖。
will ____ ___. don’t do If you ____ ____ exercise, you ____ get fat
2. 如果我早完成作业，我会早点睡。
will ____ I ____ go to bed early if I finish my _____ homework early. 3. 如果你把水煮开，它会变成水蒸气。
B. If sentences: actions with possible results
A If you write a shopping list, If you telephone your classmates, If you look it up in the dictionary, If you go to bed earlier, If you check your timetable every night, B they’ll tell you what homework to do. you’ll remember to get all the things. you’ll find out its meaning. you won’t feel tired in the morning. you’ll know which books to take.
(pin/a/if/stick/you/bursts/into)
3. If you _______________________ cool steam, it turns into
water.
(steam / into / cool / turns / it)
melts if you heat 4. Metal _________________ it. (you/heat/melts/if) floats if you put it into 5. Wood _____________________ water. (you/put/if/floats/it) breaks if you drop 6. A glass ____________________ it. (drop/you/breaks/if)
( D)1. I’d like to play basketball with my good friends tomorrow if the weather ____ nice. A. was B. has been A. will turn C. turns C. will be B. turn D. turned D. is ( C)2. If you heat ice, it ____ into water.
(A )3. I was watching TV ____ someone knocked at the door.
A. when
ቤተ መጻሕፍቲ ባይዱ
B. while
C. if
D. though
(A )4. ____ Jenny heard the doorbell, ____ she didn’t answer it. A. Although； / C. Though； but B. But； / D. Although；but
【总结】
条件 1. If表示 “____”的意思， 引导____状语从 如果 句。当表示条件成立就____（必然/可能）有 必然 某种结果（常用于客观真理）时，主句和从句 都用________时（例1、2）；当表示条件成立 一般现在 就____（必然/可能）有某种结果时，主句用 可能 一般现在 _________时，从句用_________时，简称“主 一般将来 将从现”（例3、4）。
3. I will build many schools for the poor children if I win a billion dollars. 正确 4. If you freeze water, it will turn into ice. will turn →turns 5. My uncle visits the museum if he will have time. visits →will visit, will have →has
( B)5. My father told me that he ____ back home the next week. A. will come C. came B. would come D. comes
用if将下列句子连接起来, 并注意动词的适当形式。 1. You heat the ice. It melts. If you heat the ice, it melts. 2. You pour water onto the fire. It is put out. If you pour water onto the fire, it is put out. 3. You go to bed late tonight. You will feel tired tomorrow. If you go to bed late tonight, you will feel tired tomorrow.
一、请判断下面句子的正误，如果有误， 请更正在后面的横线上。
1. If you will do more exercise this summer, you will be very fit. will do → do 2. The candle burns, if you light it. 把逗号去掉