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

And I really don't want to just lay on the beach while everybody's having fun.

大家都会玩得很开心，我可不想到时一个人躺在沙滩上。

The thing is 实战 - SpeakingMax英语口语达人