We think it might be just right for ten- to twelve-year-olds.
我们想它或许对十岁到十二岁大的孩子正合适。
I asked him to check it for me, but he wouldn't.
我请他帮我检查,但是他不肯。
When we use a phrase like 'it serves him right', we are, in part, admitting that a certain set of circumstances has enabled justice to act of its own accord.