It's his absence that leaves the boy alone to his own devices.

正是他的缺席让这个孩子一个人,玩自己的玩具。

耶鲁公开课 - 现代诗歌课程节选

In the earlier months of this stalemate, Blondy had spotted Zwelish with or without his new family four or five times, then Doris alone with the boy in a stroller two or three others.

NEWYORKER: Lucky Alan

One boy sat alone on a linoleum floor with nothing to do.

FORBES: Magazine Article

One boy, standing alone in the corner, was silently watching the parents' power play.

NPR: 'A Tale of Music': From 'Literature from the Axis of Evil'