Hi everyone If you were to rephrase the sentence: (1) I was surprised by how much she knew about cars. using the word "extensive", and being provided with the first part of the sentence which reads (2) I would never expect her to have ... [extensive] what would your sentence look like? I took the CAE exam yestarday and I had to come up with the solution to this problem. My answer was: (2) I would never expect her to have so extensive a knowledge of cars. Only to realise a few seconds after having handed in the answer key to the examinator that the correct transformation should read as: (2) I would never expect her to have such an extensive knowledge of cars. I take it that my answer was not permissible since "knowledge" is an abstract, and more importantly, an uncountable noun, in which case the definite article should be left out?