Q: Valid English sentence (grammatically) or not: Tabs try to be kept on Bob by the FBI.

A: unacceptable

Q: Valid English sentence (grammatically) or not: The fact that scientists have now established all the genes in the human body is still not widely known.

A: acceptable

Q: Valid English sentence (grammatically) or not: Such an eminent scholar as Dr. Lucille Hein was here.

A:
acceptable