01/had been + writing
Past perfect continuous
She had been writing stories for years before her first book.
A grammar in motion
One Sentence
The same line, walked from the furthest past through the present simple and on to the future perfect continuous.
Or type a present sentence of your own. I eat chocolate.
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The form
Play starts as a plain statement. Negative, question, modals, and Castellano change the sentence on screen.
The writing had already been going on for a long time before something else in the past.