_W__h_o_e_v_e_r breaks the law should be punished. _W__h_o_e_v_e_r has helped to save the drowning girl is worth praising. _W__h_o_e_v_e_r tells lies is wrong．
B: Which of them won the gold medal __is__ __a___ _m_y_s_t_e_r_y_ to me.
4. A: He hasn’t told us the reason for his being late again.
B: _W__h_y__ _h_e___ _w__a_s__ _la_t_e__ _a_g_a_in_ has not been told.
2. A: When the plane is to take off has not been announced.
B: __It__ _h_a_s_ _n_o_t_ b_e_e_n__a_n_n_o_u_n_c_e_d_ when the plane is to take off.
3. A: It is a mystery to me which of them won the gold medal.
考 察
带有形式主语it 的主语从句 与强调句型的区别
难
点
• 如何判断是强调句型还是主语从句？
总结：
将（It is /was) ----( that/who)----括号里的词 同时去掉，看剩下的部分是否仍然成立。 若成立，则是强调句型；若不成立，则是
主语从句。
• 【2012全国】24. It is by no means clear ____
• 2. When will the work be finished is unknown. × When the work will be finished is unknown. √
• 3. What will he do after graduation is a question×. What he will do after graduation is a question.√
• 填空练习：
• 1)W_h_e_r_e_____ the meeting will be held next week hasn’t been decided yet.
• 2)W__h_e_n_____ the plan will be carried out is still unknown.
高考考点
1.考察重点：连接词的恰当选用 2.考察难点：带有形式主语it 的主语 从句与强调句型的区别
一主语从句的连接词
1. that 只起引导作用，本身无实际意义，不充 当任何成分，但不能省略。 That she left him made him heart-broken. That he is still alive is a good news to us.
-- It’s known to all that the earth is round. 2. That you missed the chance is a pity.
-- It is a pity that you missed the chance.
用it形式主语的that从句有以下四种 不同的搭配：
• 5)W_h_a_t______ we need is more time.
• 6)W_h_e_t_h_e_r___ we can arrive at the airport before 8 o’clock is still a question.
• 1. Where will the meeting be held is not decided.× Where the meeting will be held is not decided. √
It is a fact that……
事实是……
It + 不及物动词 ＋ that从句
Hale Waihona Puke It appears that…
似乎…
It happens that ….
碰巧…
It occurred to me that…… 我突然想起……
1. A: That light travels in straight lines is known to all. B: _It_’_s_ _k_n_o_w_n___to__ __a_l_l __ that light travels in straight lines.
结论2： 主语从句应使用陈述句语序
注： what 与 that在引导主语从句时的区别
what 在从句中充当句子成分，如主语、宾语、表 语，而that 则不然。 1)_W__h_a_t you said yesterday is right. 2)_T_h__a_t she is still alive is a consolation（安慰）. 3)_T_h__a_t he lost the bike worried him a lot.
B are fixed at birth, but ___________ he reaches these
limits will depend on his environment. A. where B. whether C. that D. why 2011年江苏卷第26题
A It was never clear _______ the man hadn’t reported
2.You have made a mistake is a fact. That you have
1.What you left are only several old books.
2.What you said is of great importance.
3.Whether he’ll come here is not clear.
一：改错练习
1.Where shall we spend the holiday isn’t decided. we shall
the president can do to end the strike.
• A. how
B. which
• C. that
D. what
[解析] D 考查名词性从句。句中的it是形式主语，
“____ the president can do to end the strike”
是真正的主语，这里缺少do的宾语，故用连接代词 what。
√
3. If he will hand in his homework is a questions. × Whether he will hand in his homework is a questions. √
结论1：
在主语从句中只能用whether,不能用if
考 察
Attention!!!
2.置于句首只能用whether “是否”，不充当从句 的任何成分。
他是否会参加这个话剧表演是显而易见的
__W__h_e_th_e_r_h_e_’_l_l _ta_k_e_p_a_r_t_i_n_t_h_e_p_l_ay__ is clear. _W_h_e_t_h_e_r _h_e_c_a_n_b_u_y__t_h_e _p_la_n_e__ti_c_k_e_ts_(他能否买到飞机票) doesn’t matter much.
连接词的恰当选用
重
点
3 wh-疑问词包含意思，并在从句中充当成分。
W__h_e_n_ she will be back is still a question. _W_h_a_t_ you told me just now was really a surprise. W__h_e_r_e we will hold the basketball game tomorrow is not important. W__h_i_ch_ class will win the football game is not clear. _W__h_o_ will meet him is not decided.
1. If she will come is not important. ×
Whether she will come is not important.√
2. If she will have enough time is a question. ×
Whether she will have enough time is a question
It + be + 形容词 ＋ that从句
It is necessary that… It is important that …. It is obvious that……
有必要… 重要的是… 很明显……
It + be + -ed分词 ＋ that从句
It is believed that…
人们相信…
• 3)W__h_e_n_____ the building of the car factory will be started hasn’t been decided yet.
• 4)W_h_i_c_h_____ team will win the match is still unknown.
4)_W__h_a_t caused the accident remains unknown. 5) W__h_a__t made matters worse was_th__a_t night began to fall.
6) _W__h_a_t we can’t get seems better than _w_h_a_t__ we have.