1.I had my house painting.
2.He worked hard lest he failed.
3.Give to me the pen.
4.This pen isn't yours, is this?
5.The boy felt proudly that he had won the prize.
You try first - we can then comment.
#2 "He worked hard lest he fail."
You have correctly identified the others.![]()
I think lest is followed by gerund or could +inf...inst it?
As in so much English, not an absolute and unvarying rule.