it is ten years since he worked here为什么既指他已经在这工作十年了,又指他不在这工作已经十年了不要说没这两种说法,有是有,但我想知道为什么,不明白的人不要误导

It is ten years since his father died..同意句his grandpa ------- -------- ------- -------ten years ago It is ten years since he ____(join) the army It is ten years since his father dead.同义句.急.His father____ ten years____.His father____ ____ ____for ten years. Tom is ten years old.（提问ten years old） She is ten years old.对ten years old 提问. It is five years since we began to enjoy a _________spring holiday each yearA.ten-dayB.ten dayC.ten day'sD.ten-days It is ten years ince he left the army 翻译 为什么用is It is ten years since Miss Green returned to Canada为什么不用It has been ten years since Miss Green returned to Canada It is about ten years I met you lastIt is about ten years I met you last A since B for C when D as It is ten years since I ___________ (leave) my hometown怎么填啊 It is ten years since I got home last night..啥意思 it is ten years () i left home.A since B after It is about ten years __________ I met you last.A.since It is ten years since his father died.翻译尽量精准,谢谢 英语 自他参军至今已有十年了. It is ten years --- he --- the army since,the,is,he,ten,Party,joined,years,it (连词成句) It is ten years ago (that) I came to this town. the farm is no longer the one that it was ten years ago为什么用THAT