Question

Ребятки, помогите пожалуйста, есть у меня какие нибудь ошибки тут? This date will never erased from history, she will remain forever in the calendar. The heroism of the fallen soldiers immortal. And we must remember what the cost of our happiness.

Answer 1

This date will never be erased from history, it will remain forever in the calendar. 
The heroism of the fallen soldiers is immortal.
And we must remember the cost of our happiness. (лучше без "what")

Answer 2

Based on the provided text, it appears to be a statement rather than a question. However, I can help you review the text for any errors or improvements. Here is the revised version:

"This date will never be erased from history; it will remain forever in the calendar. The heroism of the fallen soldiers is immortal, and we must remember the cost of our happiness."

The revised version maintains the original meaning while improving the clarity and flow of the statement. Let me know if you have any further questions or if there's anything else I can assist you with!