条件状语从句(八年级英语精品课件)

If the world does not end, they will love each other forever.
根据句意， 用 if或unless填空
1. My grandma can see better __i_f ____ she wears glasses.
2. She will keep on singing _u_n_l_es_s_ she is told to stop.
• if从句 • 条件状语从句: • if..not or unless
主将从现 prediction
时态口诀:
主现从现 fact
Self-assessment
How well do you konw this grammar ?Tick √ the boxes 1.I can use conditional sentences correctly 2.I can use if... not and unless correctly. 3. I know the important and difficult points in the text. 4.I get further understanding of the grammar
believe me?
If I ask you to stay, would you show me the way?
If you jump , I will jump.
Hale Waihona Puke Baidu
If you die, I will be very sad.
Really?
If you jump, I will jump. I wil从l j句ump if you主ju句mp
The main clause talks about the results that will certainly happen.
If you put sugar into water, it disappears.
if 从句 ,
主句
It disappears if you put sugar into water
Conditional sentences (2)
教材：沪教牛津版 学科：英语 学校：宝安第一外国语学校
If I walk, would you run?
If I stop, would you come?
Conditional sentIfeI nsacyeyosu’re the one, would you
If you jump into water, you disappears. You frightened me, but it is true.
The if-clause talks about a possible action
If you jump into water, you _d_is_a_p_p_e_a_r__.
3. __U_n_l_e_s_s____ you listen to the teacher carefully, you won’t know the answer.
4. I will take that computer __i_f____ I have enough money.
Sum up
主句
if 从句
Look and say
If you take a fish out of water, __i_t _d_ie_s___.
_It_t_u_r_n_s _in_t_o_w__a_te_r_if you heat ice.
If you do not lose weight, I will not marry you. What?
在If引导的条件状语从句中，主句还可以使用情 态动词或是祈使句，从句都是一般现在时。
在含有If引导的条件状语从句中，主句为下列情形之一的，条件状 语从句要用一般现在时。
1）主句是一般将来时 If it rains tomorrow, I will stay at home. 2）主句谓语含有情态动词may, can, must, would, should等 If I say you’re the one, would you believe me? 3）主句是祈使句 If you are happy, clab your hands.
Unless you lose weight, I will not marry you.
条件状语从句：if...not and unless
4
if...not
unless
If you do not lose weight, I will not marry you.
Unless you lose weight, I will not marry you.
If you die,I will feel very sad .
从句
主句
If you open your eyes, you will feel you are flying in the
If 从句 If I can help you, If you believe me,
主句 would you believe me? open your arms and close eyes.