What is the greatest invention of the year?

-It is eco sneakers. ​★★★​

-내일이 어버이 날이잖아.너는 카네이션 준비했니?

-It is Parent​'s day tomorrow. Did you prepare ​the carnation? ⇒ Tomorrow is Parent's day. Did you prepare the carnations?

=> Corrected : The sentence is corrected grammatically.​

-이런! 깜빡 했어.나도 사야겠다. ​

-Oh! I forget it. I have to buy it too. ⇒⇒ Oops! I forgot. I have to buy them, too. 

=> Another way: Your sentence is okay and this is another way of saying it.​​

-그런데 돈이 없네. 

-But I don`t have money.⇒⇒ But I have no money. Can I borrow some money?

=> Corrected : The sentence is corrected grammatically.​