I was looking at prepositions with my student, and they asked why the sentence:
'I am surprised that how much money they want to pay him.'
As a native speaker I know that it would be better to say:
'I am surprised by how much money they want to pay him.'
but I am not sure why 'surprised that' can't be followed by 'how much'. If anyone could shed some light on the rules about when 'surprised that' can and can't be used, it would be very helpful.