日本語をクリックすると英文が表示されます。まずは自分で英語にしてから答え合わせを。
He wants to know how to study English.
Will you please tell me what to buy at the store?
Do they know where to go?
As both books look interesting, I don't know which to buy.
I don't know what to do now.
Does your mother teach you how to cook?
Please tell me when to start(leave).
He is learning how to use the machine.
Please tell me what you want to do.
You must(have to) decide which book to buy.
He did not know why she began to cry.
Why is it necessary to study many subjects?