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When do I have to use the word "out" after a verb in English?
I see. What about phrasal verbs that use "out", like "cut out" or "opt out"? When do I use those?
Phrasal verbs that include "out" have a variety of meanings depending on the context, but generally involve the idea of separating or removing something. "Cut out" can mean to stop doing something abruptly, while "opt out" means to choose not to participate in something.