to find something very difficult, to have a hard time with something (the subject and object roles are inverted relative to the English phrasing, like with gustar)
Cuando estoy de pie, me cuesta respirar. ― When I'm standing, I find it hard to breathe.
Le cuesta mucho pronunciar esa palabra. ― He has a really hard time pronouncing that word.
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In this volume, we discuss the alphabet, definite and indefinite articles, and verbs ser and estar, among other
topics.