from then on用壹般過去時或現在完成時；
from now on
英 [fr?m nau ?n] 美 [fr?m na? ɑn]
adv.從現在開始;從此;從今以後;往後
例句
1.From now on you are free.
從今以後妳自由了。
2.We're going to have to economize from now on
從現在開始，我們不得不節約開支。
from then on
英 [fr?m ?en ?n] 美 [fr?m n ɑn]
從此;從那時起
例句
1.From then on, they were taking no chances
從那時起，他們就不再冒險了。
2.From then on, mother and daughter have depended on each other for survival.
從此，母女倆相依為命。