The only time I can think clearly is when I'm alone.

我能清醒思考的惟一时间就是当我独处时。

《柯林斯英汉双解大词典》

When I'm alone, I have time to think about my goals and to develop a strategy to reach them.

每当独处的时候，我便有时间可以想想自己的目标，并想好实现目标的策略。

youdao

Especially when I'm alone, but no-one really asked me before... I feel strengthless and hopeless.

特别是孤单一人时，但以前没人真正地问过我……我觉得既无力又绝望。

youdao

And I'm never happier than when I'm alone.

FORBES: Dear Abby

I've articulated the pleasure of birding, in much the same way, and if only to myself, when I'm alone in the woods and trying to dissect my ability to spend hours with my binoculars focused on something 6 inches long a thousand feet away, my glasses fogging over, and my neck and arms aching.

WSJ: Park Filmmakers Wing It

But at least I know I'm not alone when I lie to my kids in the name of good parenting.

NPR: Hide the Hot Fudge