instruction: Is the next sentence syntactically and semantically acceptable?

It is to be gentle that John promised.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Mary persuaded to leave John.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The writers didn't so believe the boy.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

When Alison and David soaked their feet was after dinner

response:
acceptable