YOU SAID:

i am going to see a concert in a few days

INTO JAPANESE

私は数日後にコンサートを見るつもりです

BACK INTO ENGLISH

I will see the concert in a few days.

INTO JAPANESE

数日後にコンサートが始まります。

BACK INTO ENGLISH

The concert starts in a few days.

INTO JAPANESE

コンサートは数日後に始まります。

BACK INTO ENGLISH

The concert starts in a few days.