Writing about a future hapenning with a present time narrative

It is called prophecy, which is very common in fiction. Future events may be mere hints or suggestions (eg guns described in chapter 1 later become murder weapons), sometimes explicitly explained (as your example).

If the book has a first-person narrator, a clear instruction will normally be displayed only when it is a memorandum style in which it is written (after all events of the book the person is described in an advantageous position It will be shown).

Hopefully this is an effective way to shape the audience's expectations. But it can definitely be awful. I have read a book I think is convincing. It is mainly because it is a comfortable family drama, but the author of the first page foresees a big tragedy. The addictive part of this book is to know what happens. But at the end of the book, nothing bad happened. I feel like I'm cheating

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When you are writing your own story it is appropriate to talk about what has happened in the past, what is going on right now, and the future in the future tense. But going back and forth between them is hard to do, it can confuse the reader. Use the words and phrases of the signal to help the reader follow the necessary changes in the verb tense. For example, "I thought that I brought a car wreckage, an accident happened two years later, I understand that this is not my fault now I will stick to the verb tense

The verb tense shows that the time of action (past, present, future) is related to the time of writing and reading. Each sentence and paragraph, and the order of the tense of the verb throughout this article, must be consistent to maintain a clear temporal relationship. The following sentence begins with the current tense, shows that the custom under discussion is continuing, but it is obviously a thing of the past. Simple and complex sentences whose subjects precede the verb before the object tend to be monotonic with the same weight on each claim. For example, this compound sentence "Gas temperature reached 600 degrees and liquid boiling" will match these two ideas to a typical child's style (went to the circus, ate candy, and had a picnic).

On the other hand, cooperation with the future is more speculative, as we deal with possibilities rather than facts. Ironically, the imagination of the future far exceeds the past. When writing articles about the future, you are always limited by today's ideas, ideology, and social structure. It is difficult to imagine a completely different future from the present. On the contrary, when writing the past, you realize that our current thinking, ideology, and social structure are neither natural nor eternal, and reality is stranger than any SF novel.