YOU SAID:

I'm off home on my bike

INTO JAPANESE

自転車に乗って家にいません

BACK INTO ENGLISH

I am not at home by riding a bicycle.

INTO JAPANESE

私は自転車に乗って家にいません。

BACK INTO ENGLISH

I am not at home leaving my bicycle.

INTO JAPANESE

私は家にいるのではない。

BACK INTO ENGLISH

I am not at home.

INTO JAPANESE

今家にいません。

BACK INTO ENGLISH

I am not at home now.

INTO JAPANESE

私は今家にいません。

BACK INTO ENGLISH

I am not at home now.