A classic example is "This statement is false". It is neither true nor false, so it is not a statement.
EDIT: Please see user21820's comments below, in particular his link to this post:
Is Godel's modified liar an illogical statement?
A classic example is "This statement is false". It is neither true nor false, so it is not a statement.
EDIT: Please see user21820's comments below, in particular his link to this post:
Is Godel's modified liar an illogical statement?