YOU SAID:

my son, so dumb, IQ 21

INTO JAPANESE

私の息子、とても頭が悪い、IQ 21

BACK INTO ENGLISH

my son is so dumb iq 21

INTO JAPANESE

私の息子はとても頭が悪いです IQ 21

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My son is very stupid IQ 21

INTO JAPANESE

私の息子は非常に愚かなIQ 21です

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my son has a very stupid iq 21

INTO JAPANESE

私の息子は非常に愚かなIQ 21を持っています

BACK INTO ENGLISH

my son has a very stupid iq 21