instruction: Is the next sentence syntactically and semantically acceptable?

They'd leave soon.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The scissors is lost

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The ship's sinking was very devious.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The teacher is proud of his students.

response:
acceptable