今非昔比的英文：
The present cannot compare with the past.

参考例句：

The present cannot compare with the past
今非昔比

At the outset of her career she was full of optimism but not now.
她事业伊始十分乐观,但现在已今非昔比了.

present是什么意思：
adj. 目前的，现在的；出席的，在场的；现在时态的
v. 赠送；提出；介绍；举枪瞄准；呈现
n. 礼物；现在

There is at present uncertainty regarding the hazard to health presented by crocidolite.
目前，青石棉对健康的危害尚不清楚。

Some diseases are presented by heredity.
有些疾病是由于遗传导致的。

should alternately present as undulate .
激情平淡应呈波浪形交替出现。

cannot是什么意思：
v. 不能，无法

This achievement cannot be bettered.
这一成就好得不能再好了。

If you have a bad cold you cannot taste.
如果患了重感冒，就尝不出味道。

The received wisdom is that they cannot win.
大家一致认为他们不会赢。

compare是什么意思：
v. 比较，相比，对照；喻为
n. 比较

To whom, then, will you compare God? What image will you compare him to?
你们究竟将谁比神，用什么形像与神比较呢？

This view is beyond compare.
这景色无与伦比。

The achievements of an athlete and a writer are not comparable.
运动员的成就与作家的成就不能相提并论。