Take (someone) for a fool phrase
To think, believe that someone lacks intelligence.
You think that I can be cheated so easily, don't you? You must be taking me for a fool!
Those having taken me for a fool were all in awe after I solved that puzzle.
The king mistakenly took his servant for a fool and got dethroned by that servant.
The verb "take" must be conjugated according to its tense.
The origin of this phrase is not clear.
Try to avoid to change something because doing something else could make things worse
I could have changed my answer, but I decided to leave well enough alone.