Where I think English would be surprising, if discovered as a new language, is the phonology: we have lots of extremely unusual and hard-to-pronounce consonant and vowel sounds. You can take whole classes just to learn how to pronounce the English /r/ in a way that sounds right. Which makes it especially unfortunate as a world language.
While true that is "solved" by having very distinct accents. Somebody from Oxford, Melbourne, Delhi and Houston ( all pronounce the /r/ and other sounds quite different, but will still understand each other (given a little will on both sides)
And the closer you get to London the more the English have a French culture. By that I mean an inferiority/superiority complex. They’re always better than everyone else.
E.g. “I wondered what did he do” will be understood perfectly by virtually 100% of English speakers, but will immediately mark you as a non-native speaker (the correct form is “I wondered what he did”).
The real problem is understanding English spoken by those native speakers in all their accents...
Plurals and articles seem to trip up many non-native English speakers. The rules for these things are quite intricate and riddled with exceptions, and if you write a page of prose and make a single mistake with a plural or an article, a native English reader will instantly know you are not a native speaker, even if your meaning is understood.
Example: "if you write page of prose and make single mistake with plural or article, native English reader will instantly know you are not native speaker."
"Ships are 'she', except in the American navy, where littoral surface combatants are 'he'", or "...except in the British navy, where submarines are 'he'", something like that, isn't it? Guess I'll only talk about "the vessel", which should pretty reliably be "it".
> Plurals and articles seem to trip up many non-native English speakers. The rules for these things are quite intricate and riddled with exceptions, and if you write a page of prose and make a single mistake with a plural or an article, a native English reader will instantly know you are not a native speaker, even if your meaning is understood.
Fortunately not so bad for speakers of German and the Nordic languages, which work rather similarly. (Germans usually give themselves away by using the compound in stead of simple past tense.)
> Example: "if you write page of prose and make single mistake with plural or article, native English reader will instantly know you are not native speaker."
The canonical example seems to be the Slavic languages, above all Russian.
Yeah, that's me.
> almost totally dying out
That too.
> among the younger generations.
That's not me.
It's really annoying that we're modifier-modified when it comes to adjectives but modified-modifier when it comes to relative clauses. We say "the red car", but "the car, which is red,".
Also we sometimes use modified-modifier for adjectives for poetic effect, in constructs such as "painter extraordinaire", "minister plenipotentiary", or "court martial".
And then we have questions, where English goes from normally being SVO to being OSV. We say "That is John." but ask "Who is that?", and if we say "That is who?", it's usually an expression of abject shock. Or sometimes we dip into our Germanic heritage and bring out V2 word order (https://en.wikipedia.org/wiki/V2_word_order#Vestiges_in_Mode...).
English grammar is actually very regular. It has lost most of the complexity of its Germanic substrate due to the repeated historic pidginization. For a learner, the lack of grammatical gender is godsent and a turbo hack to producing grammatically correct sentences.