from then on与since than在用法上有什么区别哪个该用现完,哪个该用过去时?辅导书上有句：From then on,nobody has caught that disease.Frome then on,they lived together happily.是不是两种都可以?

since then 与from then on 用法区别 ever since then与哪个同义 ever since,from then on,in the past,from now on from then on 和 since then 有什么区别 since then和 from then on有什么区别? from ever since和since then和after that time和from then on的区别? ever since与from then on 有什么区别?（期待你的答案） ever since 与 from then on 有什么区别?（期待你的回答） from now on与from then on Imet MARY in 1976.we haven't met each other___.A.since ever B.from then on C.ever since D.after that 为何选C? from then 与 since that time 有什么区别 你好请问from now on 与since then、since now有什么区别?能从含义和用法（时态)方面分别说说么?谢谢! since then 和 from then on 用法相同吗?如果不同那有什么区别? from then on & ever since then有何区别,请举几个例子,谢谢 from then on与什么时态连用 since then on和from then on的区别?还有since now on 和from 呵呵】还有分别用于什么时态？ 从那以后是from then还是since then? Until last week i hadn't seen her since1978,___i had wondered where she was living.A.since thenB,since when C,from when D,from then on 求翻译及具体解答, 这道题改选since then (A)还是 from then on(B) They met in 1998 and _______ they were best friends.这是来自初中英语资料上的原题.since then (A)与 from then on(B)两个选项同时出现,我相信很多人都搞不定.我也相信