英語(yǔ)三級(jí)每日口語(yǔ)(8.27)：I’m at a loss as to what to do

I'm at a loss as to what to do.
    我真不知該怎么辦才好。
    今天的幾個(gè)句子是有關(guān)為難的：
    1. I don't know what to do.
    該怎么辦呢?
    2. Don't worry, I'll help.
    別擔(dān)心，我來(lái)幫你。
    3. I'm unable to decide for myself.
    我一個(gè)人決定不了。