Simple present—here 'have' is the main verb and changes with person just like others ( have/has; go/goes; see/sees; eat/eats ) I/You/We/They have a sandwich. He/She/It has a sandwich . Present perfect—here 'have' is a helping verb for 'be', and 'been' is the past participle, just as for other verbs ( be/been; go/went; see/seen; eat/eaten ): I/You/We/They have been hungry for three days.
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