He try to climb the tree, but he could not.

他尽力去爬树，可是爬不上去。

youdao

He knew he was behaving unworthily, but he could not help it.

他知道他的行为是可耻的，但他却不由自主这样做。

youdao

He now wanted to pull his over—hasty head back again, but he could not.

现在，他想把他那草率过栅栏的脑袋缩回来，可是他太急了，做不到。

youdao

But he could not win the support of his Republican Party.

VOA: special.2010.04.29

I don't know how he could not think there was a bubble, but he didn't see it.

我不知道他为何认为不存在泡沫,但是他没有看出来

耶鲁公开课 - 金融市场课程节选

Well,that's what we could say,but we can't say that until we decide he's not Napoleon.

我们是可以这么说，但只在我们认为他不是拿破仑时。

耶鲁公开课 - 死亡课程节选

Mr Remy's solicitors said the player denied the allegation, but he could not comment.

BBC: QPR striker Loic Remy arrested in gang rape investigation

But he could not seem to get his beloved leader out of his mind.

NPR: Chavez Heir Barely Wins; Opposition Rejects Count

But he could not release pilots unless they were not required by the IAF.

BBC: NEWS | South Asia | India's air force 'needs to grow'