YOU SAID:
I wonder if Jack will come back
INTO JAPANESE
ジャックが戻ってくるかどうかのかしら
BACK INTO ENGLISH
I wonder whether or not come back Jack
INTO JAPANESE
ジャック戻ってくるかどうかかな
BACK INTO ENGLISH
Whether or not come back Jack!
INTO JAPANESE
ジャックはもどって来るかどうか!
BACK INTO ENGLISH
Whether or not come back Jack!
That didn't even make that much sense in English.