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.
