George doesn't mix much; he likes to keep to himself. - George does not mix much; he likes to keep to himself.
George doesn't mix much; he likes to keep to himself.
George does not mix much; he likes to keep to himself.
Tom doesn't like cheese. - Tom does not like cheese.
Tom doesn't like cheese.
Tom does not like cheese.
... Iran does not build a nuclear weapon but if Iran's leaders ...
... does not necessarily say valuable information. ...