from then on和since then区别

since then只可用于现在完成时中，不可用于过去完成时、过去将来完成时等时态。
from then on可用于过去时也可用于现在完成时或将来时中，要看语境决定。
since then：以后;从此一直。
since then：以后;从此一直。

扩展资料

　　From then on, mother and daughter have depended on each other for survival.

　　从此，母女俩相依为命。

　　We become companion in misfortune from then on.

　　从那时起，我们就成了患难之交。

　　The mechanics of the job, however, have changed little since then.

　　不过，工作流程从那以后就几乎没有任何变化。

　　Europe has moved a long way since then at a very quick pace.

　　从那以后，欧洲迅速发展，并取得了长足的进步。