"Yes, yes; for certain that was Kay," said Gerda.(“是的，是的；那一定是加伊。”格爾達說。)

She couldn't know what time he'd go, or even for certain that he'd go at all.(她不知道他何時要走，甚至于還不能確定他究竟要不要走。)

If your child regresses to babyish behaviour, all you know for certain is that the child is under stress.(如果你的孩子退步到幼稚的行為，你可以肯定的是孩子正處在壓力之下。)

Early kites were built for certain uses.(早期的風箏有特定的用途。)

McKee and his team now knew for certain that they had found the wreck, but were as yet unaware that it also housed a treasure trove of beautifully preserved artefacts.(麥基和他的團隊現在已經確定他們找到了沉船，但他們還沒有意識到這艘船里也有一個保存完好的藝術品寶庫。)

The courts were empowered to impose the death sentence for certain crimes.(法院有權因某些罪行判處罪犯死刑。)

There are many things she knew for certain.(她對很多事情都很有把握。)

So, honestly, I don't know for certain yet.(所以，實話說，我都不知道究竟會是誰。)

For certain personal reasons I shall not be able to attend.(由于某種個人原因，我將不能出席。)

I can't say for certain when we'll arrive.(我說不準我們什么時候能到。)