Question

처음으로 래프팅하러 가는 거라서 너무나 신이 나요 -아/어서 cannot be affixed by the tense markers -았/었- and -겠-. However, it can be used with the -ㄴ/은/는/(으)ㄹ 것이- structure. When followed by -아/어서, the -것 (or -거) part becomes 것이어서, 거여서, 것이라서 or 거라서. Again, versions with -이라서 are more common.

Accepted Answer

This is my first time going rafting so I'm very excited

Front	처음으로 래프팅하러 가는 거라서 너무나 신이 나요
Back	This is my first time going rafting so I'm very excited
Notes	-아/어서 cannot be affixed by the tense markers -았/었- and -겠-. However, it can be used with the -ㄴ/은/는/(으)ㄹ 것이- structure. When followed by -아/어서, the -것 (or -거) part becomes 것이어서, 거여서, 것이라서 or 거라서. Again, versions with -이라서 are more common.

처음으로 래프팅하러 가는 거라서 너무나 신이 나요 Time