YOU SAID:

Ever since you went to uni I've been sofa surfing with a rucksack

INTO JAPANESE

あなたがユニに行って以来、私はリュックサックでソファサーフィンをしてきました

BACK INTO ENGLISH

I've been surfing the couch with a rucksack since you went to Uni

INTO JAPANESE

あなたがユニに行って以来、私はリュックでソファをサーフィンしてきました

BACK INTO ENGLISH

I've been surfing the couch with a rucksack since you went to Uni