宾语从句的语序是陈述句语序，即连接代词/副词+主语+谓语+其他成分。即：连接代词/副词+陈述句语序。例句如下：I don't know what they are looking for.Could you tell me when the train will leave?
无论主句是陈述句还是疑问句，宾语从句都必须使用陈述语序，即“主句+连词+宾语从句(主语+谓语+……)”句式。根据连接词在从句中所担任的不同成分，可分为以下四种：
1)连接词+谓语。连接词在从句中作主语。常见的连接词有：who，what，which等。如：
Could you tell me who knows the answer，please?你能告诉我谁知道答案吗？
The small children don't know what is in their stockings.这些小孩子不知道袜子里有什么东西。
2)连接词+名词+谓语。连接词在从句中作主语的定语。常见的连接词有：whose，what，which，how many，how much等。如：
He asked whose handwriting was the best in our class. 他问我们班上谁的书法最好。
The teacher asked us how many people there were in the room. 老师问我们房间里有多少人。
3)连接词+主语+谓语。连接词在从句中作宾语、状语或表语。常见的连接词有：who(m)，what，which，how many，how much，when，why，how，where，if/whether(在句中不充当任何成分)等。如：
He hasn't decided if he'll go on a trip to Wuxi. 他还没决定是否去无锡旅行。
