instruction: Is the next sentence syntactically and semantically acceptable?

Captain Oates died in order to save his comrades.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Handsome though I know several boys who are, I'm still going to marry Herman.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The river froze solid.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I assumed him to be innocent

response:
acceptable