Verb conjugation of "potere" in Italian

I like to watch TV at night before going to bed. Sometimes it is important to me to do something senseless. If I'd read a book I would need to concentrate and my brain would be focused on a specific topic. I sometimes do not want that.
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I have problems with adjectives, endings and articles. The grammar is so difficult. I am very happy to learn Spanish with you. What went wrong with the lessons? Thanks and best regards.