Verbs are typically considered to be irregular verbs if their past tense form and/or past participle are not formed by adding -ed or -d to the end of their root form. The word been is the past participle of the irregular verb be. All three of these phrases are combined with the present participles of other verbs to form their past perfect continuous (as in had been working) and present perfect continuous (as in has/have been working) forms. Had been is the past perfect form of be and is used regardless of the subject. Have been is the form used with any other subject (including the pronouns I, we, and they). Has been is the form used with a third person singular subject (including the pronouns she, he, and it-but not singular they). Has been and have been are both present perfect forms of the irregular verb be.
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