宾语从句:(that常可省略)
1.用that引导: I'm sure (that) she will come.
2.用whether/if引导:表"是否"(但if不可放在句当"是否")
I don't know whether it will be fine tomorrow.
3.用疑问词引导(what,when,where,which,how,who,whose,why):
He didn't understand why they were laughing.
Do you know who is he?
Do you know where are they going?
Do you know what are they doing?
Do you know which girl is Lucy?
Do you know why he is late for class?
Do you know whether/if it will be sunny tomorrow?

Do you know how to make a model ship?
Do you know when Lucy willcome back?
希望帮到你望采纳 谢谢!