Some time ago为何time不加s

Some time ago为何time不加s some time ago 翻译 some years ago 和long time ago一样吗如题 Another time some months ago,是定语从句吗 Some time A long time ago 与 Long time agoLong time ago前必须加a吗?在句子中只用long time ago,不加a,符合语法吗? Long Time Ago 歌词 A long time ago A light passenger plane lew off course some time ago.course 为何没有冠词?A light passenger plane flew off course some time ago.course 表示航线/航道是可数名词,那为何没有冠词?不是该 the course 或 a course A Long Time Ago 歌词 a short time ago中文 翻译：a short time ago would you please come here---?a some other time b other some time c other time d some time else 为什么不选d而选a some expressions were imported from England a long time ago帮忙翻译下, Some time ago he was too fat, but now he doesn't have this p________ 用some time 造句 give some time off take some time翻译?