YOU SAID:

this can't possibly work

INTO JAPANESE

これはおそらくうまくいかない

BACK INTO ENGLISH

This probably won't work

INTO JAPANESE

これはおそらくうまくいかないでしょう

BACK INTO ENGLISH

This will probably not work

INTO JAPANESE

これはおそらくうまくいかないでしょう

BACK INTO ENGLISH

This will probably not work