YOU SAID:
If I could go to china I would visit the great wall.
INTO JAPANESE
私が中国に行くことができたら、私は偉大な壁を訪れるだろう。
BACK INTO ENGLISH
If I could go to China, I would visit a great wall.
INTO JAPANESE
私が中国に行くことができれば、私は大きな壁を訪れるだろう。
BACK INTO ENGLISH
If I could go to China, I would visit a big wall.
INTO JAPANESE
私が中国に行くことができたら、私は大きな壁を訪れるだろう。
BACK INTO ENGLISH
If I could go to China, I would visit a big wall.
That didn't even make that much sense in English.