instruction: Is the next sentence syntactically and semantically acceptable?

His expectations are always lower than mine.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I whipped the eggs into a froth.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

What this girl in the red coat will do is put a picture of Bill on your desk before tomorrow.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Dracula thought him to be the Prince of Darkness.

response:
acceptable