from then on是什么时态的标志

from then on是将来时的标志。from then on从那时起，和过去时连用；

例如

From then on , magic had to be young William s life。

从此以后,小威廉注定要献身魔术。

She left in 1984 and from then on he lived alone.

她于1984年离去，从那时起他便独自一人生活。

From then on, they were taking no chances

从那时起，他们就不再冒险了。

From then on the whole tone of the campaign began to degenerate.

从那时起，整个活动的基调开始变质。