I did run fast enough to catch the bus.

我跑得很快，追上了那辆公共汽车。

youdao

And I couldn't run fast enough.

我已经不能跑得足够快了。

youdao

They were about to enter the city gate when he whipped up his horse to rush ahead, and then said, "Not that I was brave enough to be the rearguard, but that my horse didn't run fast enough."

快进城门的时候，他鞭打自己的马跑冲到队伍前面，说，‘不是我敢于殿后，是刚才马跑得不快。’

youdao

"If I hadn't gotten into my slip fast enough, I believe he would have run me over, " Ferrelle told an investigator.

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