Many times I heard people mention that English is dynamic but none could say why and what makes it dynamic. May I know specifically what make English dynamic.
Dynamic just means it changes to suit its environment.
English does change, but it doesn't change on a daily basis. The changes should be measured in years or decades.
For example:
Hither and thither are now obsolete.
Whom is on its last legs.
Over time, efficiency changes the rules.
It's hard to swallow sometimes, but that's how it is.