The answer is conditional and subjunctive moods.
The conditional mood is used to talk about improbable situations and circumstances which depend on some condition.
For example: <em>If all wars were ended, the world would be a happier place.</em>
The subjunctive mood is used to describe wishes and hypothetical conditions.
For instance: <em>I wish all wars were ended. </em>
Answer:
I think it's recent studies suggest that the language changes ..
