verbs - What's with the passive present perfect progressive?



I was taught that we made passive voice using be + the participle of the main verb, without changing the verb tense. E.g.,



I send letters. (present simple)
Letters are sent. (present simple of 'Be' + participle)


I sent letters. (past simple)
Letters were sent. (past simple of 'Be' + participle)


I was sending letters. (past progressive)
Letters were being sent. (past progressive of 'Be' + participle)


I have sent letters. (present perfect)
Letters have been sent. (present perfect of 'Be' + participle)



Works beautifully, right? That is, until a student asks you "How about…"



I have been sending letters. (present perfect progressive)
Letters HAVE BEEN BEING SENT. (present perfect progressive of 'Be'?!)



I said that would be too weird to say (is it not‽ ) and it would be more appropriate to say Letters have been sent, to which the student retorted: But then you are changing the verb tense. It is no longer progressive.


Can anyone explain, please?




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