YOU SAID:
my sister think im stupid
INTO JAPANESE
私の妹は愚かな考え
BACK INTO ENGLISH
My sister thought stupid
INTO JAPANESE
私の妹は愚かだと思った
BACK INTO ENGLISH
I thought my sister was stupid.
INTO JAPANESE
私は妹が愚かだと思った。
BACK INTO ENGLISH
I thought my sister was stupid.
Well done, yes, well done!