I do not know what to do.
我不知该怎么办。
A: You look so upset. What's wrong? 甲：你看上去很沮丧。怎么了？ B: I don't know. I do not know what to do. 乙：不知道。我不知该怎么办。 He was at a loss to know what to do. 他不知道该怎么办。 I've no idea which way to turn. 我不知道该干什么好。 I really have no idea what to do. 我真不知道该做什么. I am at my wit's end. 我不知所措了。
I give up.
我放弃了。
A: I give up. 甲：我放弃了。 B: Why? There are still hopes. 乙：为什么？还有希望的。
I drop.
I quit.
I surrender.
