YOU SAID:

I am wearing Sponge Bob underpants right now.

INTO JAPANESE

スポンジボブ パンツを今着ています。

BACK INTO ENGLISH

SpongeBob SquarePants pants wearing right now.

INTO JAPANESE

スポンジボブは、今着ているパンツします。

BACK INTO ENGLISH

SpongeBob is wearing the pants.

INTO JAPANESE

スポンジはパンツをはいています。

BACK INTO ENGLISH

SpongeBob is wearing pants.

INTO JAPANESE

スポンジは、ズボンを着ています。

BACK INTO ENGLISH

SpongeBob is wearing pants.