instruction: Is the next sentence syntactically and semantically acceptable?

It was Ann who bought a first edition of Richard III for $1000.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Susan whispered to Rachel.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

How hard to read the book was it?

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Tom bathed Fido in the garage.

response:
acceptable