② I have a lot of homework to do.
③ I want something to eat.
④ I have nothing to do.
⑤ Do you have anything to do tomorrow?
⑥ He works hard to buy a car.
⑦ I visited Nara to see my aunt.
⑧ Why did you get up early today?
――Because +ＳＶ
――To cook breakfast. / To run in the park.
⑨ I know what to do. （何をすべきか）
⑩ I know how to do it. （そのやり方、方法、手段）
⑪ Do you know how to get to the airport? （how to get to：行き方）
⑫ It is easy to make (cook) pizza.
⑬ It is hard for me to explain in English.
（hard → important, difficult, interesting, dangerous）
⑭ I am too hungry to fall asleep right now. （right now：すぐに）
⑮ The ice on the lake is too thin for us to skate on. （thin：薄い）
⑯ You are old enough to get your driver’s license.
⑰ This bag is so heavy that I can’t carry it.
This bag is too heavy (for me) to carry. （itは要らない）
⑱ The house is so expensive that we can’t buy it.
The house is too expensive to buy. （itは要らない＝目的語Ｏがない）