YOU SAID:

I want to go to the mall, but I can't because I must go to the theatre, but when I get back, I will go to the mall

INTO JAPANESE

私はモールに行きたいが、劇場に行かなければならないのでできないが、戻ったらモールに行く

BACK INTO ENGLISH

I want to go to the mall, but I can't because I have to go to the theater, but when I get back I go to the mall.

INTO JAPANESE

私はモールに行きたいが、劇場に行かなければならないのでできないが、戻ったらモールに行く。

BACK INTO ENGLISH

I want to go to the mall, but I can't because I have to go to the theater, but when I get back I go to the mall.