I mean, I think it might be weird in that it uses a periphrastic construction that is analogous to the modern german perfect to express ongoing action in the past, but this is just how English puts these things together in its typical hyperanalytic fashion.
I mean, languages do strange things all the time. It's not that weird.
Take Classical Egyptian syntax on the other hand. A language that has essentially only nouns, verbs, prepositions, but they essentially only syntactically behave as either one of nouns or adverbs.
I swear, it's the most fucked up system of grammatical syntax that I've seen in my entire life.