?以前

... even now 即使如此 before now 以前 now that 既然,由于 ...

?在此以前

... even now 即使现在 before now 在此以前 yet 还 ...

?现在

体罚孩子无益于教育 ? Corporal punishment be unleashed on the child's education 以前 现在 ? Before now 我能再爱你一次吗？ ? I can love you one more time?

?从前

... the day before yesterday前天 the week before last上上星期 before now从前,以前 ...