YOU SAID:

I'll do that marriage

INTO JAPANESE

私はその結婚をします

BACK INTO ENGLISH

I'm going to get married to that

INTO JAPANESE

私はそれと結婚するつもりです

BACK INTO ENGLISH

I'm going to marry it

INTO JAPANESE

俺はあいつと結婚するんだ

BACK INTO ENGLISH

I'm going to marry her.

INTO JAPANESE

俺はあいつと結婚するんだ

BACK INTO ENGLISH

I'm going to marry her.