YOU SAID:

is this a pencil that is mine?

INTO JAPANESE

これは私は、鉛筆ですか。

BACK INTO ENGLISH

Is this me a pencil?

INTO JAPANESE

この私は、鉛筆ですか。

BACK INTO ENGLISH

This is my pencil?

INTO JAPANESE

これは私の鉛筆ですか。

BACK INTO ENGLISH

This is my pencil?