saw a beautiful garden.
T
4. a. Reading the evening newspaper, a
dog started barking.
F
b. I was reading the evening newspaper
-ing形式作状语
1.-ing 短语在句子中可作状语，来修饰谓语动词 或整个句子，表示动作发生的 时间、原因、条件、结果、让步或伴随 等情况。
2. -ing短语作状语一般表示一个次要的动作， 一般都可以变为相应的状语从句或并列句。
1. 作时间状语 -ing短语作时间状语要置于句首。如： Hearing the bad news , they couldn't help crying. =When__th_e_y__h_e_a_rd__th_e__b_a_d_n_e_w_s__ , they couldn't help crying. 当听到这个不幸的消息时，他们情不自 禁地哭了起来。
_H_a_v_in_g__fi_n_is_h_e_d___(finish) his homework, he rushed out to play basketball.
2. 作原因状语 -ing 短语作原因状语置于句首。如： Being so angry , he couldn't go to sleep.
Though working from morning till night , his father didn't get enough food. =Though_h_i_s_fa_t_h_e_r_w_o_r_ke_d__fr_o_m__m_o_r_n_in_g______ t_ill_n_i_g_h_t _, he didn't get enough food. 虽然他父亲从早到晚拼命地干活，但是他还 是挣不到足够的吃的。
Choose the correct sentence.
1. a. Hearing the news, tears ran down
her face.
F
b. Hearing the news, she cried out
sadly.
T
2. a. Entering the classroom, I found
nobody in Байду номын сангаасt.
T
b. Entering the classroom, nobody was
found in it.
F
3. a. Looking out through the window, the
garden was beautiful.
F
b. Looking out through the window, we
=Because___h_e__w_a_s_s_o__a_n_g_ry___ , he couldn't go to sleep. 因为太生气了，他不能入睡。
Having been to the Great Wall many times , he didn't go last week. =_B_e_c_a__u_s_e_(_A_s_)___ he had been to the Great Wall many times , he didn't go last week. 因为他已经去 过长城许多次，上周他就没去。
Having received his letter , I decided to write back.
=After___I _h_a_d_r_e_c_e_iv_e_d__h_is_l_e_tt_e_r__ , I decided to write back.
收到他的信后，我决定给他回信。
注意：当 v-ing 形式所表示的动作发生在谓语动 词动作之前时，应使用完成式： having done
time.
2. 动词-ing形式在句中作状语时，其逻
辑主语与主句的主语保持一致。如：
He traveled on the plane like this, keeping the tortoise hidden in a blanket. = When he traveled on the plane like this, he kept the tortoise hidden in a blanket.
3. 作条件状语 -ing作条件状语置于句首或句末。如： Working hard , you will succeed. =If___yo_u__w_or_k_h_a_rd___, you will succeed. 如果你勤奋一点，你就会成功。
4. 作让步状语 -ing短语作让步状语，可置于句首或 句末，常与even if, though 连用。如：
5. 作伴随状语 置于句首或句末。如： They came into the classroom, singing and laughing .
=They sang and laughed ; they came into the classroom.
他们又唱又笑地走进教室。
注意： 连词+现在分词 1. -ing短语与when, while, though, until, if 等连词连用时，相当于这些 连词引导的一个从句。如： When working in the factory, he was an advanced worker. =When__he__w_o_rk_e_d_in__th_e_f_ac_t_or_y____ , he was an advanced worker.
Though willing to attend the party, he refused the invitation.
= Though he was willing to attend the party, …
用 “连词+现在分词”的结构 If you play all day , you will waste your valuable time. = If playing all day, you will waste your valuable