Why should you be despaired of your success of your undertaking?

1.you despair of the success of your undertaking2.you despair of success of undertaking3.you be despaired of the success of your undertaking4.

No improvement

Somewhere the answer is given 3rd and elsewhere 1st. Please provide explanation


Both #1 and #3 are correct, but they are very old-fashioned. People don't talk that way anymore.