YOU SAID:
いい 友達を 選ばなければ なりません。
INTO JAPANESE
いい 友達を 選ばなければ なりません。
BACK INTO ENGLISH
You have to choose good friends.
INTO JAPANESE
良い友達を選ばなければなりません。
BACK INTO ENGLISH
You have to choose good friends.
That didn't even make that much sense in English.