YOU SAID:
The little boy is sniggering
INTO JAPANESE
小さな男の子はくすくす笑っています
BACK INTO ENGLISH
Little boy is smirking
INTO JAPANESE
小さな男の子が笑っています
BACK INTO ENGLISH
Little boy is laughing
INTO JAPANESE
小さな男の子が笑っています
BACK INTO ENGLISH
Little boy is laughing
That didn't even make that much sense in English.