instruction: Is the next sentence syntactically and semantically acceptable?

I promised that around midnight he would be there.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Ellen told a story at Helen.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The rock placed the sky with the fork.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I divulged when Bill promised to call me, but I did so reluctantly.

response:
acceptable