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1·I can run fast.

我能跑得快。《牛津词典》

2·He pretended to be hurt and unable to run fast.

他假装自己受伤，不能跑得快。

3·The race started and Dale tried his best to run fast.

比赛开始了，戴尔尽他的全力跑得快些。

4·They can stay alive because they run fast to avoid lions and other enemies.

它们能活下来是因为它们跑得快，能够避开狮子和其他敌人。

5·She lost the game because the weight of her shoes made it difficult for her to run fast.

她输了比赛，因为鞋子的重量使她很难跑得快。

6·You don't have to run fast.

你不必跑得很快。

7·Sled dogs can run fast.

雪橇狗跑得快。

8·In 'run fast', the adverb 'fast' is a postmodifier.

在run fast中，副词fast是后置修饰词。《牛津词典》

9·Camels can run fast on sand with large feet.

骆驼的大脚使它在沙地上跑得很快。

10·You don't have to run fast or for long to see the benefit.

你不需要跑得多快、多久，就能看到好处。