If you don’t clean your teeth regularly, you will have toothache Unless you clean your teeth regularly, you will have toothache
2. get very hot, put the air-conditioner on soon
Eg: You will be late for school unless you leave now. You will be late for school if you don’t leave now.
Unless sentences exercises
1. have toothache, clean your teeth regularly
2. If he __p_as_s_e_s (pass) the test ，we may_b_u_y_ (buy) a car.
3.Get up early, not be late
If you get up early, you won’t be late .
4.Take a fish out of water, die
Pair work
If you stay at home, you will be sorry.
If you work until night, you will be tired.
If we break the traffic rules, we will get a fine and even be in danger.
If it is fine tomorrow, we will go on a school trip. we will climb mountains.
If I study hard, I will go to Beijing University.
If I have enough money,
I will travel around the world.
If you have a robot, what will you do?
Example: If I have a robot, I will let it…
▪ play games
▪ clean my bedroom ▪ do homework for me
主句（一般现在时） 从句（一般现在时）
Can ‘if’ be replaced by other words?
相当于when从句
Exercises: change the following sentences into if sentences
1. If she _re_t_u_rn_s_(return) from Paris, please _c_a_ll_(call) me.
4.We w__il_l _h_a_ve(have) a barbecue unless it _r_a_in_s__ (rain) .
5.If you _c_o_o_l (cool) water, it _t_u_r_n_s(turn) into ice.
1.If you _d_r_o_p__ (drop) a glass, it _b_r_e_a_k_s(break).
2.He w__il_l _fa_i_l (fail) in the exam if he _d_oe_s_n_’_t study (not study) hard.
3.Unless you _l_e_a_v_e_ (leave) now, you _w_i_ll_b__e(be) late.
If sentences
A：actions having results that will probably happen
(1) If sb does sth, sb will do sth
= sb will do sth if sb does sth
主句（将来时）
从句（一般现在时）
(2)主句为祈使句或情态动词形式 If sb does sth, please do sth
If sb does sth, sb may(情态动词) do sth
If sentences
B：actions having results that will certainly happen
主语的行为将导致某种必然发生的结果时
If sb does sth, sb/sth h if sb does sth
初中英语条件状语从句优秀课 件
Look and say
If the telephone rings, I will answer it.
If you get up late, you will be late for school.
If you feel hungry, you should eat something.
If you don’t put the air-conditioner on soon , you will get very hot.
Unless you put the air-conditioner on soon , you will get very hot.
More practice
If you feel tired, you must have a rest.
If you are ill, you must go to see a doctor.
If you are riding a bike in the street, you must be very careful.
If you take a fish out of water, it dies.
5.Heat metal, melt
If you heat metal, it melts
条件状语丛句只有if…sentenses一种吗？
C：Unless： sb will do sth unless sb does sth if sb does not do sth