instruction: Is the next sentence syntactically and semantically acceptable?

We were glad it was over.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The bed was fallen on by the dust.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

This scratch will cost Kim $500 to fix.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I'm sorry he bought a car.

response:
acceptable