YOU SAID:

If John had had had had then mark would have had had.

INTO JAPANESE

ジョンが持っていたら、マークも持っていただろう。

BACK INTO ENGLISH

If John had it, Mark would have too.

INTO JAPANESE

ジョンがそれを持っていたら、マークも持っていたでしょう。

BACK INTO ENGLISH

If John had it, Mark would too.

INTO JAPANESE

ジョンがそれを持っていたなら、マークもそうするだろう。

BACK INTO ENGLISH

If John had it, so would Mark.

INTO JAPANESE

ジョンがそれを持っていたなら、マークもそうするだろう。

BACK INTO ENGLISH

If John had it, so would Mark.