YOU SAID:

hello my friend needs to buy a pink shirt

INTO JAPANESE

こんにちは私の友人はピンクのシャツを購入する必要があります

BACK INTO ENGLISH

Hi my friend must buy a pink shirt

INTO JAPANESE

こんにちは私の友人はピンクのシャツを買わなければなりません

BACK INTO ENGLISH

Hi my friend must buy a pink shirt