How can you tell when someone who speak spanish as a mother language is speaking english?

I mean, how can you tell when there’s someone whose language is not english? Even if he/she speaks it really really good. Which are the normal mistakes people who speaks spanish do when it comes to speak english?
And yes, my first language is not english, is spanish… that’s why I’m asking.
Sorry for the mistakes I made in the question, but I’m trying to improve my english since I’m going to live in England really soon.

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