Давайте разберем этот текст и преобразуем его в правильное время, чтобы он звучал грамматически правильно. Мы будем использовать прошедшее время, так как все события уже произошли.

1. Начнем с первой части: "Tom Smith was a writer. He (to write) detective stories for magazines." Здесь мы можем использовать прошедшее время для глагола "to write". Правильный вариант будет: "He wrote detective stories for magazines."

2. Далее: "One evening he (to be not able) to invent an end for a story." Здесь мы используем "was not able" для передачи невозможности в прошлом: "One evening he was not able to invent an end for a story."

3. Следующая часть: "He (to sit) with his typewriter in front of him, but he (to have) no ideas." Мы преобразуем это в: "He was sitting with his typewriter in front of him, but he had no ideas."

4. Затем: "Then he (to go) to the cinema." Здесь мы используем "went": "Then he went to the cinema."

5. Далее: "When he (to leave), a burglar (to break) into his flat and (to read) his story." Здесь мы должны использовать "left", "broke" и "read": "When he left, a burglar broke into his flat and read his story."

6. Следующий момент: "The visitor (to leave) Tom a note: 'I have read your story and I (not to think) much of it.'" Мы используем "left" и "did not think": "The visitor left Tom a note: 'I have read your story and I did not think much of it.'

7. Затем: "I (not to go) to steal anything tonight, but I will return, when you become a successful writer." Здесь мы используем "did not go" и "would return": "I did not go to steal anything tonight, but I would return when you became a successful writer."

8. И наконец: "Tom (to study) the burglar's suggestions and wrote the rest of the story." Мы используем "studied": "Tom studied the burglar's suggestions and wrote the rest of the story."

Итак, итоговый текст будет выглядеть так:

Tom Smith was a writer. He wrote detective stories for magazines. One evening he was not able to invent an end for a story. He was sitting with his typewriter in front of him, but he had no ideas. Then he went to the cinema. When he left, a burglar broke into his flat and read his story. The visitor left Tom a note: 'I have read your story and I did not think much of it. I did not go to steal anything tonight, but I would return when you became a successful writer.' Tom studied the burglar's suggestions and wrote the rest of the story.