ring是不规则动词变化,其过去式和过去分词分别是rang, rung。类似变化的英语单词还有:
sing—sang, sung
drink—drank, drunk
例如:Did you ring him up yesterday? 你昨天给他打电话了吗?
I rang him up ten minutes ago. 我十分钟前给他打电话了。
I have rung him up already. 我已经给他打过电话了。