独自一人

He went to the bandits' lair all by himself!

独闯了土匪窝。

I work more efficiently on my own.

我独工作效率更高。

I was alone with no money or possessions.

我独，有钱，有财产。

He was alone in the house.

独在家里。

He was alone in the room.

独在屋里。

One can habituate oneself to living alone, though rarely with any pleasure.

虽然独生活很少会有乐趣，但还是可以习惯的。

He was unhappy when alone.

独时感到不快活。