A lot of questions have been dedicated to how the evolution of English got many constructs of the old either fall out of use, merge, or evolve into different forms but still with 1:1 relation to original. The English of Victorian times was significantly more complex than modern-day English.
But I'm quite convinced that elements of grammar didn't just die out or evolve into uniform counterparts — I'm fairly sure entirely new ones were borne over time, or simple cores were branched out into multiple, significantly different, more complex variants.
Can you identify elements of contemporary English grammar that would simply baffle someone who spoke Early Modern English?
Common, everyday constructs of grammar that don't have simple direct counterparts of the old, or are significantly more complex? New tenses? Inflections where there was none?