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Why is it necessary to study many subjects?
It is impossible to master a foreign language in a year.
You must(have to) decide which book to buy.
Is it easy to drive a car?
He is learning how to use the machine.
It is important to learn(study) English.
Does your mother teach you how to cook?
It is difficult for him to get up early in the morning.
As both books look interesting, I don't know which to buy.
It is very easy for them to speak English.
Will you please tell me what to buy at the store?
It is interesting for you to collect stamps, isn't it?