My friend said he heard people saying "This is too much expensive." or "This one is too much cheap." I have only learned to say "This is too expensive." or "This is too cheap." Is what my friend heard about correct?
Re: "too much......"
What your friend probably heard is 'this is much too expensive/cheap'. 'Too much +adjective' is incorrect, although 'too much +noun' is common: 'I ate too much turkey on Thanksgiving, and it is much too fattening'.
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