句型：主语+连词+宾语从句。
复合句中作宾语的从句叫宾语从句，宾语从句可以由从属连词，连接代词或连接副词引导，这三类词在句中的功能各异，请见下表具体用法。
1. 宾语从句的用法。
we know (that) we should study hard.
that可以省略且在句子中不作任何成分）
i don’t think he can pass that exam.
think后的that一般都省略不用，believe和suppose也是如此）
we don’t know whether/if our teachers will attend the class meeting.
whether/if连接主句we don’t know和从句，不作任何成分但不可省略）
please let me know whether or not you’ll come to the wedding.
whether or not不作任何成分，只起连接作用，此时不能用if）
i know who cooked the great food.
who既作连接代词，又在从句中作主语）
you must take back what you said.
what既作连接代词，又在从句中作谓语动词said的宾语）
could you tell me who he is?
who既作连接代词，连接主句could you tell me和从句，又在从句中作表语）
he asked me which shirt i like beat.
which在从句中作定语，修饰shirt）
i want to know when the plane will take off.
when既作连接副词，连接主句i want to know和从句the plane will take off，又在从句中作时间状语）
he told me where the accident happened.
主句是he told me，where是连接副词，在从句中作地点状语）
our teacher asked me why i was late.
why在从句中作原因状语）
mike asked me how i could do the work without any help.
how在从句中作方式状语）
可带宾语从句的形容词：
在动词，介词，动词不定时，动词ing形式和过去分词后都可以带宾语从句，某些形容词，如sure，happy，glad，certain，pleased等之后也可以带宾语从句。
i’m sure (that) peter will like this book.
we are glad (that) bob will attend our tea party.
2. 使用宾语从句需注意的问题。
1.）时态的一致（主从句时态的一致）
宾语从句中如果主句是现在的时态（一般现在时，现在进行时，现在完成时），从句的时态可根据实际情况而定。
i think he lives here.
i know he lived here ten years ago.
i h**e heard that he will come.
宾语从句中如果主句是过去的时态（包括一般过去时，过去进行时）那么从句的时态一定要用过去的时态（一般过去时，过去进行时，过去将来时，过去完成时）
i know who lives here.
i knew who lived here.
every day our personnel manager asks us if everybody is here.
our personnel manager asked us if everybody was here.
he has said that he has seen it.
he said that he had seen it.
2.）语序的变化。
陈述句变为宾语从句时，语序不变。
陈述句：he is an honest man.
宾语从句：i said that he was an honest man.
陈述句：we’ll win.
宾语从句：we believe we’ll win.
一般疑问句变为宾语从句时，语序要变为陈述句语序，用if/whether连接宾语从句。
一般疑问句：does he study hard?
宾语从句：i wonder if/whether he studies hard.
一般疑问句：will they win?
宾语从句：i asked if/whether they would win.
引导动词的宾语从句whether和if一般可互换，若后面有or not则只能用whether不能用if
i wonder whether he studies hard or not.
引导介词的宾语从句则只能用whether连接不能用if
the picnic will depend on whether the weather will be fine or not.
如果一句话中宾语从句很长，那么可以用it作为形式宾语，以免句子头重脚轻。
he made it quite clear that he preferred to study english.
3.）特殊疑问句变宾语从句时，语序要变为陈述句语序，用连接代词或连接副词（意思就是保留原来的疑问词）连接宾语从句。
特殊疑问句：who is he?
宾语从句：do you know who he is?
特殊疑问句：what does he want?
宾语从句：i don’t know what he wants.
特殊疑问句：when did he le**e?
宾语从句：i know when he left.
特殊疑问句：where will he arrive?
宾语从句：he asked me where he would arrive.
特殊疑问句：how long did it take you to finish the job?
宾语从句：did your boss know how long it took you to finish the job?
特殊疑问句：why won’t you spend the holiday with your parents?
宾语从句：she wants to know why i won’t spend the holiday with my parents.
特殊疑问句：which skirt do you like best?
宾语从句：my mother asked me which skirt i liked best.
如果对主语提问，则特殊疑问句的语序不变，变为宾语从句时，其语序依然不变。
who went there?
i wonder who went there?
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