I knew I had to get up early.

我知道我得早起。

《柯林斯英汉双解大词典》

We've got to get up early, all right?

我们得早起床，可以吧？

《牛津词典》

She finds it very difficult to get up early.

她觉得很难早起。

《牛津词典》

She was a milkmaid. She had to get up very early every morning and go to the barn to milk the cow.

VOA: special.2010.11.20

You either move slow and get up early, or move faster and get up later.

WHITEHOUSE: First Lady Michelle Obama Q&A with Children

You have to get up early each day and grind away at it if you want consistent results.

FORBES: One ratio does not fit all

They get jobs, they have to get up early, they stop going to the disco, they have kids.

ECONOMIST: The harm done