if条件状语从句ppt课件
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3.-- g
4.-- a
5.-- h
6.-- c
7.-- f
8.-- e
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1. If you _h_e_a_t_ic_e_,_it_t_u_r_n_s_in_t_o___water.
2. A balloon _b_u_rs_t_s_if_y_o_u__st_ic_k__a_p_in__in_t_o it.
If you heat ice, it melts. 主句和从句都用___一_般__现__在__时___(时态) 因为if引导的条件句说的是客__观__事_实__/_普_遍__现__象
If you stand in the rain, you get wet.
4
Actions with definite results
• 读下列例句,试着自己总结if 的用法:
• 1. If you heat metal, it melts. • 如果把金属加热,它就会融化。 • 2.Water turns into ice if you cool it. • 如果你冷却水,它就会变成冰。 • 3.If you stand in the rain, you get wet.
• 如果把金属加热,它就会融化。
从句
主句
• 2.Water turns into ice if you cool it.
• 如果你冷却水,它就会变成冰。
主句
从句
从句在主句前时,_用___ (用/不用)逗号隔开
当主句在前时,则_不__用_ (用/不用)逗号
3
If you drop a glass, it breaks.
12
Look and say
If you get up late, you will be late for school.
get up late late for school
13
Look and say
If the telephone rings, I will answer it.
ring answer
• 如果你站在雨里,就会淋湿。
• 4.If you drop a glass, it breaks. • 如果你把玻璃杯掉在地上,它就会碎。
5
• 由例句我们可以知道:
• 如果if引导的条件句谈论的是一种 __真_理__/ _客_观__事_实__ 时,主句谓语动词便不用 shall/will+动词原形,而直接用_一_般__现__在_时 的动词形式。
9
Actions with possible results
• 读下列例句,总结if 的用法:
• 1.If he runs, he’ll get there in time. • 如果他跑步去,就会及时赶到那。 • 2.He will help you if you ask him. • 如果你请他帮忙,他会帮你的。 • 3.If you fail in the exam, you will let him down. • 如果你考试失败了,你会让他失望的 • 4.If you get up late, you will be late for school. • 如果你起床晚了,上课就会迟到。
6
Water __t_u_rn_s___ (turn) into ice if you _____co_o_l___ (cool) it. If you ___st_a_n_d__ (stand) in the rain, you ____g_e_t ___ (get) wet.
7
1.-- b
2.-- d
16
Look and say
sunny this Sunday
go fishing . If it is sunny this Sunday, I’ll go fishing .
17
P105 B
• William has five problems • Give him some advice from column A and B
3. If you _c_o_o_l _s_te_a_m_,_i_t _tu_r_n_s_i_n_to_water.
4. Metal __m_e_l_ts__if_y_o_u_h_e_a_t_______it. 5. Wood f_lo_a_t_s_if_y_o_u__p_u_t _it_in_t_o_water. 6. A glass__b_r_e_a_k_s_if_y_o_u__d_ro_p__ it.
14
Look and say
a lot of money
a big house
If I have a lot of money, I will buy a big house.
15
Look and say
hard-working
get good grades
If she is hard-working, she will get good grades.
• 1 I sometimes forget to take the right book to school.
• If you check your timetable every night , you’ll know which books to take.
If sentences
If 引导的条件状语从句
1
If you cool water, it turns into ice.
①
②
Biblioteka Baidu
if clause 从句
main clause 主句
2
if clause从句
main clause主句
• 1. If you heat metal, it melts.
10
• 由例句我们可以知道:
• 在if 引导的条件状语从句中,如果从句谈论 的是一个有可能发生的事实以其产生的相 关结果,从句用___一_般__现_在__时__态__, 主句用 __一__般_将__来_时__态_____.
(主将从现)
11
I _w__il_l s_t_a_y_(stay) at home if it __ra_i_n_s__ (rain) tomorrow. If he _d_o_e_sn_’_t_c_o_m_e__ (not come), I ____w_il_l _g_o_____ (go) swimming alone.