if引导的条件状语从句 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.
【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)。

  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。”
一、请判断下面句子的正误,如果有误, 请判断下面句子的正误,如果有误, 请更正在后面的横线上。 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

  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
二、根据中文意思完成句子。 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。 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, c
  6. If you plant seeds in soil, f
  7. If you drop a glass,
Result b.it dies. c.they grow. d.it turns into ice. e.they die. f.it breaks. g.it becomes steam.
b
  1. If you take a fish out of water, a.it melts
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. (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)
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.
( 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 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
( B)
  5. My father told me that he back home the next week. A. will come C. came B. would come D. comes
将下列句子连接起来, 用if将下列句子连接起来 将下列句子连接起来 并注意动词的适当形式。 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.

  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.
 

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