Is the following sentence linguistically acceptable?
Sally might be pregnant, and I know a girl who definitely is pregnant.

acceptable

Is the following sentence linguistically acceptable?
Cheryl stood on the table.

unacceptable

Is the following sentence linguistically acceptable?
The candidate was dogged by charges of infidelity and avoiding the draft, or at least trying to.

acceptable

Is the following sentence linguistically acceptable?
Cohen proved the independence of the continuum hypothesis.
acceptable