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Tue 9 Oct, 2007 06:43 pm
11.I don't know how often I haven't warned you. > I don't know how many times I have warned you.
12.His speech leaves much to be desired. > His speech is not satisfactory.
The first one, "I don't know how often I haven't warned you." doesn't make much sense. It seems to mean "I don't know how many times I have refrained from speaking". It does not mean what you say when you paraphrase it.
You have interpreted the second sentence correctly.
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