3.当与or not连用，或提出两种选择时:
• I don’t know whether he’s free or not. • Mary asked whether I was doing my homework
or not. • Tell me whether you’d like to go shopping or tidy
2.He said (that) _h_e__m_i_s_se_d__u_s_v_e_r_y_m__u_c_h__.
3.The teacher told us (that) _t_h_e_e_a_r_t_h_m__o_v_e_s_ __a_r_o_u_n_d__th_e__s_u_n__.
由从属连词 whether, if 引导的宾语从句
2. Ask him __w__h_e_t_h_e_r_(_if_)_h_e_c_a_n__c_o_m_e___. 3. I wonder _w__h_e_t_h_e_r_it__is_g_o_i_n_g__to__r_a_in__o_r_n_o_t. 4. Could you tell me_w__h_e_th__er_(_i_f)_M__r_L__i _li_v_e_s_h_e_r_e?
代词或副词连接主句和从句，并在从句中担任 句子成分，具有一定的意义，不可省略。
1. He asked __w_h_o_c_o_u_l_d_a_n_s_w__er__th_e__q_u_es_t_io_n____. 2. Do you know__w_h_o_m__t_h_e_y_a_r_e_w__a_it_in_g__fo_r___? 3. He asked_w__h_o_se__b_ik_e__w_a_s_t_h_e_b_e_s_t_i_n_t_h_e_c_la_s_s__. 4. Do you know _w__h_e_n_w__e’_l_l _h_a_v_e_a_m__e_e_ti_n_g___? 5. Please tell me __w_h_e_r_e_h_e__is___. 6. Can you tell me _h_o_w__I_c_a_n__g_e_t _to__th_e__st_a_ti_o_n__? 7. Could you tell me _w__h_y_t_h_e_t_ra_i_n_i_s_l_at_e______?
（简单句）
1. I know
主语 谓语
him .
宾语
（复合句）
2. I know who he is .
主语 谓语
主句
宾语从句
一、宾语从句三要素
引导词（连接词） 语序 时态
（一）引导词
1 由hether, if 引导的宾语从句 由连接代词 Who,whom,whose,which,what
3 和连接副词 where,how,why,when 引导的宾语从句
由从属连词 that 引导的宾语从句
注：that 在句中无词汇意义，在从句中 不能充当成分，在口语当中往往省略 e.g.
1.I hear (that) _h_e_w__il_l _b_e_b_a_c_k__in__a_n__h_o_u_r_.
4. I don’t know __w_h_e_th_e_r_ or not he is well.
5. I don’t know _w_h_e_t_h_er_ to go.
大家有疑问的，可以询问和交流
可以互相讨论下，但要小声点
由连接代词 Who,whom,whose,which,what 和连接副词 where,how,why,when引导的宾从
if/ whether “是否”，说明对陈述的事物不明确或不清 楚。常用在ask, wonder, can(could) you tell me 等后。
I want to know ___i_f _(w__h_e_th__er_)__h_e_w_i_l_l _g_o_t_o t_h_e_p__a_rk__w_i_t_h_u_s__.
A. if
B. where C. whether D. that
D. which
3. The teacher asks us __B__ Jim can come back on
time .
A. that B. if
C. when D. what time
4. Does anybody know ___C___ we will have a sports
meeting this weekend or not .
the room.
4. 宾语从句提前时： • Whether this is true or not, I can’t say.
Practice time if / whether 1. I asked her _if__/_w__h_et_h_e_r she had a bike.
2. We’re worried about __w_h_e_t_h_er_ he is safe. 3. I wonder __w_h_e_t_h_e_r _/_if_ he is well.
只能用 whether不能用 if 的情况
1. 在介词后面： • I’m thinking of whether we should go fishing. • We are worried about whether it will rain tomorrow.
2. 在动词不定式前(whether to do sth.) ： • They asked me whether to go skating.
Practice
1. The young man asked __D___ it's summer or winter.
A. either B. that C. weather D. whether
2. We don't know ___A___ they did it .
A. how B. who C. what