I can't do this alone.

否则我无法独自完成。

youdao

I thought I could do this myself, but I'm afraid I'm in over my head. I just can't handle things alone.

我不能自己做这个，这个超出我的能力范围之内了。我不能单枪匹马做这个啊。

youdao

Things like "I can't do this, why am I alone, I don't have any one to talk to, I cannot do this anymore. " That kind of thing. I cry them outloud, too.

“我做不到，为什么我这么孤独，我找不到人倾诉，我再也受不了了，”诸如此类的声音不断回响在脑海，我只能哭。

youdao

But if we're going to win the race, here's the thing: I can't do this alone.

WHITEHOUSE: President Obama Holds a Town Hall in New Hampshire

Mr. LEE: (Singing) I don't know if I can do this alone.

NPR: Folk-Soul Singer Amos Lee in Concert

And I don't know if I, I can do this alone.

NPR: Folk-Soul Singer Amos Lee in Concert