YOU SAID:

I am so sore because I went mountain biking yesterday.

INTO JAPANESE

マウンテン バイク昨日行ったのでとても痛いよ

BACK INTO ENGLISH

Mountain bike yesterday, so it hurts.

INTO JAPANESE

マウンテン バイク昨日、それは痛いので。

BACK INTO ENGLISH

Mountain bike yesterday, it is sore.

INTO JAPANESE

昨日、マウンテン バイク、痛いです。

BACK INTO ENGLISH

Yesterday, mountain bike, Ouch.

INTO JAPANESE

昨日、マウンテン バイク、痛い。

BACK INTO ENGLISH

Yesterday, mountain bike, Ouch.