宾语从句的语序为陈述语序。所以得先搞清楚什么是陈述语序。
1.什么是陈述语序？
【主语在前，其它所有动词在后】
She likes drinking tea.
她喜欢喝茶。
[主语she在前，动词likes在后，是陈述语序]

若be动词/助动词/情态动词在前，主语在后，则不是陈述语序。
Does she like drinking tea?
[助动词Does在前，主语she在后，不是陈述语序]

2.宾语从句的陈述语序
>引导词在从句中作主语或修饰主语时的语序
【引导词主语+动词+其他】
Do you know who came here last night?
你知道昨晚谁来这里了吗？
[引导词主语who + 动词came+...]


She wonders which book is better.
她想知道哪本书更好。
[which book作主语]

>引导词不作主语时的语序
【引导词+主语+动词+其他】
I know that she enjoyed the movie.
我知道她喜欢这部电影。

I know where he is.
I know where is he. （×）
我知道他在哪里。

I know who she likes?
I know who does she like?（×）
你知道她喜欢谁吗？
[引导词who+主语she+动词likes]

He asked me where he could find you.
He asked m where could he find you. (×)
他问我他可以在哪里找到你。

3.注意：即使主句是疑问句，从句仍用陈述语序。
Do you know when I was born? 
你知道我是何时出生的吗？