直到妈妈回来他才不哭了用英语怎么翻译

He didn't stop crying until his mum came back.为何不用He isn't告诉我嘛因为stop是动词，构成否定要用助动词don't/doesn't/didn't
因为整句都是过去时语境
所以用didn't
望采纳Thank you