What do you mean? There are allophones of /t/, yes... At the end of a word (if nothing follows), /t/ can be pronounced in three different ways, as far as I know: 1) Released: you can hear the /t/, which is sometimes aspirated to some extent 2) Not released: you can't hear the /t/, but the tongue touches the roof of the mouth anyway.
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Anonymouswhat are the difficult for learning English about allophones?I don't understand your question, but one thing about allophones is that you don't need to learn them in order to be understood: you'll be understood anyway.