Sentence examples for it is not certain whether from inspiring English sources

"It is not certain whether this is unusual".

It is not certain whether foul play was involved...

It is not certain whether he died there from the injury or near Pisa by suicide.

It is not certain whether or not he also lived in Iwami, as some sources suggest.

It is not certain whether he will be able to get that much further.

It is not certain whether the late Cardinal Basil Hume told the rule-breaker to desist.

As none of the paintings is signed, it is not certain whether he himself did any of them.

"At this point, it is not certain whether the venture will be operating six months from now".

It is not certain whether those earliest self-reproducing organisms were proteins, nucleic acid protein associations, or viruses.

It is not certain whether NK cells belong to a distinct lineage or are a special form of lymphocyte.

It is not certain whether luminescence has any relationship to mating, since nonluminous Odontosyllis exhibits similar courtship behaviour.