`12`. I get to work in 20 minutes.
=> It takes me 20 minutes to get to work.
It + takes/took + sb + time + to V: ai đó tốn bao lâu để làm gì.
`13`. She had never been so unhappy before.
=> She was unhappier than she had been before.
`14`. The last time she had a swim was five years ago.
=> She hasn’t had a swim for five years.
hoặc She hasn’t had a swim since five years ago.