YOU SAID:

I am an only child until now.

INTO JAPANESE

私は今まで一人っ子であります。

BACK INTO ENGLISH

I is an only child until now.

INTO JAPANESE

今まで一人っ子です。

BACK INTO ENGLISH

It is an only child until now.

INTO JAPANESE

今まで唯一の子です。

BACK INTO ENGLISH

This is the only child ever.

INTO JAPANESE

これはある唯一の子であります。

BACK INTO ENGLISH

This is the only child.

INTO JAPANESE

これは唯一の子供です。

BACK INTO ENGLISH

This is the only child.