No.
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It can be improper AND negative (less than 0 and so less than 1).
An improper fraction is a fraction whose size is greater than ' 1 '. The size of ' -0.6 ' is less than ' 1 ', so it doesn't have enough to it to make an improper fraction.
It can't be expressed as an improper fraction because it is less than 1 but as common fraction it is 1/4
You cannot. By definition, an improper fraction has an absolute value which is greater than 1 whereas a regular fraction has a value less than 1.
As an improper fraction it is 4/1