Sentence examples for impossible to be certain from inspiring English sources

It was impossible to be certain who was responsible for their deaths.

It is, of course, impossible to be certain of the credibility of what we were told.

It is impossible to be certain what role the online abuse may have played in her death.

But he, too, said it was impossible to be certain because he had not actually seen the avalanche break loose.

As usual with Venus, it was impossible to be certain whether the public face reflected the inner reality.

Scientists on several panels acknowledged that it was impossible to be certain about unforeseen effects from new engineering techniques.

For example, if the exact position of an electron is identified, it is impossible to be certain of the electron's momentum.

It is impossible to be certain that improving the human rights of 25 million people is worth the cost because no one knows what the cost will be.

Mr. Trenin said he believed that more than 15,000 people were executed there, but without access to records, it is impossible to be certain.

But he and others say it is impossible to be certain that the seemingly defective embryos could never have grown into normal babies if they were implanted.

There have already been elections in which it is impossible to be certain that the right candidate was declared the winner.