Dave's ESL Cafe's Student Discussion Forums

[puzzle]

Dear teachers,
Can you explain the following sentence for me:
The next morning I'd just about given myself up for lost when I was spotted by a ship.
What part of speech is lost? Why is it used after preposition"for"?
Thank you very much!

[pugachevV]

If you give yourself up for lost, you have given up all hope of being found and expect to die.

Lost is the past participle of the verb to lose