"Zij blijken lang te zijn."
Translation:They appear to be tall.
I think it more depends on what "Zij" is refering to. I agree that when it refers to females it should be tall but when it refers to objects it can be long too. However I grew up out in the country in the Netherlands where we not always spoke the most correct dutch :)
Hi Lennart, If you translate "zij blijken lang te zijn" into "they turn out to be..." you rather give the impression to want to emphasize the reason why they are (or became) long and you are not just reporting the specific state of being (long). So, respecting the original meaning of the sentence, "turn out" as translation is not applicable. Best wishes, Lu.