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Agatha Christie (be) the author of 78 mystery novels and 19 plays. Ever since her first novel “The Mysterious Affairs at Styles” (publish) in 1930, her books never (be) out of print. They(translate) all over the world and perhaps surprisingly her sales actually (increase) since she (die) in 1976. By 1990 two immensely successful films “Death on the Nile” and “Murder on the Orient Express” ‘(make), the television series of which (follow) them a year later.
       People (enjoy) Agatha Christie’s story telling for many years and now her popularity  (seem) higher than it (use) to be. It (be) not of course the first time , that the author  (become) more  popular in death than in life.

Agatha Christie was the author of 78 mystery novels and 19 plays. Ever since her first novel “The Mysterious Affairs at Styles” published in 1930, her books never were out of print. They translated all over the world and perhaps surprisingly her sales actually increased since she died in 1976.By 1990 two immensely successful films “Death on the Nile” and “Murder on the Orient Express” made, the television series of which followed them a year later.

People enjoed Agatha Christie’s story telling for many years and now her popularity seemed higher than it used to be. It was not of course the first time, that the author became more popular in death than in life.

Agatha Christie IS the author of 78 mystery novels and 19 plays. Ever since her first novel “The Mysterious Affairs at Styles” WAS published in 1930, her books HAVE never BEEN out of print. They WERE translated all over the world and perhaps surprisingly her sales HAVE actually increased since she died in 1976. By 1990 two immensely successful films “Death on the Nile” and “Murder on the Orient Express” HAD BEEN made, the television series of which followed them a year later.

People HAVE BEEN enjoYING Agatha Christie’s story telling for many years and now her popularity seemS higher than it used to be. It ISN'T of course the first time, that the author HAS becOme more popular in death than in life.

Я бы поправила так :)

Agatha Christie is the author of 78 mystery novels and 19 plays. Ever since her first novel “The Mysterious Affairs at Styles” was published in 1930, her books have never been out of print. They were translated all over the world and perhaps surprisingly her sales actually increased since she died in 1976. By 1990 two immensely successful films “Death on the Nile” and “Murder on the Orient Express” had been made, the television series of which followed them a year later.

People have enjoyed Agatha Christie’s story telling for many years and now her popularity seems higher than it used to be. It isn't of course the first time, that the author becomes more popular in death than in life.

It sounds to me that way👆🤗👆