判断是什么从句Could you tell me when they will leave Hangzhou.Pleas

Could you tell me[【when they will leave Hangzhou 宾语从句】.
你能告诉我他们什么时候离开杭州吗?
下面各个从句都是【宾语从句】Please tell me where your brother worked hard.
请告诉我
等会继续
You must remember what your teacher said just now.She asked Lily if she could go and get some juice.