instruction: Is the next sentence syntactically and semantically acceptable?

Mary wrote a letter to himself last year.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Medea wondered if the potion was ready

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Brian wiped the counter.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

She swatted him.

response:
acceptable