YOU SAID:

You should buy a chair

INTO JAPANESE

椅子を買うべきであります。

BACK INTO ENGLISH

You should buy a Chair.

INTO JAPANESE

椅子を買う必要があります。

BACK INTO ENGLISH

You must buy the Chair.

INTO JAPANESE

椅子を購入する必要があります。

BACK INTO ENGLISH

You need to buy the Chair.

INTO JAPANESE

椅子を購入する必要があります。

BACK INTO ENGLISH

You need to buy the Chair.