YOU SAID:

I have to go back home and grab my electric lawnmower

INTO JAPANESE

家に帰って電気芝刈り機を持って帰らないと

BACK INTO ENGLISH

I need to get home and get my electric lawn mower.

INTO JAPANESE

家に帰って電動芝刈り機を持ってくる

BACK INTO ENGLISH

I'm gonna go home and get an electric lawn mower.

INTO JAPANESE

家に帰って芝刈り機を買うわ

BACK INTO ENGLISH

I'll go home and buy a lawn mower.

INTO JAPANESE

家に帰って芝刈り機を買います。

BACK INTO ENGLISH

I'll go home and buy a lawn mower.