在句子中起宾语作用的从句叫做宾语从句。宾语从句要抓住三要素：引导词、语序和时态。
一、.引导词
1．从句为陈述句，常选择引导词that，that引导宾语从句无意义，不充当句子成分常省略。例句：He told us （that） they would help us through the whole work.
2．从句为一般疑问句，常选择引导词if或whether，表示“是否”。在 whether … or not 结构中不能用 if 替换。例句：I don’t know if there will be a bus any more.
3. 从句为特殊疑问句，常选择what,when,where,which,who,how等的疑问代词、副词作引导词。 例句：He didn’t tell me when we should meet again.
二、判断时态情况：
1.主句是一般现在时，从句可以为各种时态。
2.主句是一般过去时，从句要用相应过去时态。
注意：从句描绘客观事实、真理、自然现象等，从句时态不受主句时态限制，仍用一般现在时。
例句：He answered that he was listening to me.
Father told me that practice makes perfect .
三、宾语从句的语序要用陈述句语序
陈述句语序，就是主语在前，谓语动词在后。
错误: He is wondering when can he finish this difficult job.
正确: He is wondering when he can finish this difficult job.
注意：宾语从句的否定转移
主句的谓语动词是think,believe,imagine,suppose,consider,expect,fancy,guess等,并且主句的主语是第一人称而且为一般现在时,从句的否定词一般要转移到主句上来,其反义疑问句一般与宾语从句一致. 例如; I don’t think he will come to my party.而不能说成I think he won’t come to my party.
常见考法
对于宾语从句的考查，多以单选的形式考查灵活运用的。一般情况下，常从引导词的选择、时态的一致性及从句的陈述语序方面考查。
典型例题：Please tell me ______ last year.
A.where does your sister work B where did your sister work
C .where your sister works D where your sister worked
解析：本题考查对宾语从句的掌握。宾语从句要用陈述语序，所以排除A和 B；last year 表示过去时 ，所以排除 C 。
答案：D
误区提醒
宾语从句的语序要用陈述句语序 ，但要注意当疑问词为主语时，句式为：疑问词+谓语+其他 ，问句和陈述句语序一样。
典型例题：I didn't know ?
A. What wrong was with her B.what was wrong with her
C .what wrong is with her D.what is wrong with her
解析：主句是一般过去时，从句要用相应过去时态，所以排除C和D；在what was wrong with her中，what作主语，所以问句本身又是陈述句语序，不用变化。
答案： B
本文来自：逍遥右脑记忆 http://www.jiyifa.net/chuzhong/192201.html
相关阅读：初中英语学习指导之系统化复习有技巧