Elena, not too natural :(

1 hit on Google: https://www.google.com/search?sxsrf=ALeKk01xoMnV_yews67MUqmX3c5QM82hfw%3A1592422207787&ei=P2_qXtLML5SStAa5_73gBg&q=%22in+how+many+countries+do+they+speak+English%3F%22&oq=%22in+how+many+countries+do+they+speak+English%3F%22&gs_lcp=CgZwc3ktYWIQAzIECAAQHjoECAAQRzoFCAAQzQI6BQghEKsCUJxXWLpzYLt1aABwAXgAgAHVAYgBxwaSAQUwLjUuMZgBAKABAaoBB2d3cy13aXo&sclient=psy-ab&ved=0ahUKEwiS6JuAy4nqAhUUCc0KHbl_D2wQ4dUDCAs&uact=5 https://www.google.com/search?sxsrf=ALeKk01xoMnV_yews67MUqmX3c5QM82hfw%3A1592422207787&ei=P2_qXtLML5SStAa5_73gBg&q=%22in+how+many+countries+do+they+speak+English%3F%22&oq=%22in+how+many+countries+do+they+speak+English%3F%22&gs_lcp=CgZwc3ktYWIQAzIECAAQHjoECAAQRzoFCAAQzQI6BQghEKsCUJxXWLpzYLt1aABwAXgAgAHVAYgBxwaSAQUwLjUuMZgBAKABAaoBB2d3cy13aXo&sclient=psy-ab&ved=0ahUKEwiS6JuAy4nqAhUUCc0KHbl_D2wQ4dUDCAs&uact=5

Ok, thanks!

👍🏼

If you put IN at the end, it would sound much more natural (although it has zero hits on Google).

You mean " How many countries do they speak English in?"

Yes, that sounds extremely natural

All right, thanks!)

👍🏼

By the way, in your sentence
"How many English-speaking countries are there" wouldn't it be more natural to add "in the world"?

Unnecessary and not more natural - if anything too obvious. Where else would they be, on Mars?)))

I asked because I think I mostly saw sentences that ended with "are there in [somewhere] 🤔

You asked me if it makes it more natural. You can certain add “in the world,” but to answer your question, it’s fine (if not better) without it.

👍got it