The difference between three idioms
I want to know the difference between three idioms, "Times change and we with time.", "Times change, people change.", "Times are changing."
In my opinion, the first two idioms have the same meaning. I am not quite sure that whether the third one has a similar meaning.
Secondly, are there any other idioms that has a similar meaning.Then, are "Times have changed." and "This is one situation and that was another." common idioms/proverbs?