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has; has isn't; is hasn't; has has; hasn't
has got has received has heard from has had
has made letter writing an art has prevented wars by avoiding written communication has made world different from what it was has caused wars by magnifying and extending human conflicts
Has; given Will; be given Was; given Has; been given
is he；is isn't he；is hasn't he；has has he；hasn't
has written wrote had written was writing
seen a letter by heard a letter from heard heard from
you buy it you write a letter put a letter into a postbox it has a postmark on it
has got to has heard of has received from has heard from
to post the letter to have the letter posted to have posted the letter having posted the letter
Because of Except Besides But for
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