Different English phrases do not always mean or imply the same thing. Sometimes, the same set of words can mean entirely different things in different contexts. Take ‘if not’ for example. What can it mean and imply in different contexts? Well, let’s see and find out! What Does ‘If Not’ Mean? ‘If not’ is a … “If Not” – Meaning & Proper Usage (Helpful Examples) Read More », Common Contexts and Expressions Using “If Not” The “If Not” contrast is a versatile phrase often used in English to express several different ideas and comparisons. Two primary contexts for using this phrase include negotiating alternatives and possibilities as well as stressing uncertainty and hypothetical scenarios., High quality example sentences with “if not, why not” in context from reliable sources - Ludwig is the linguistic search engine that helps you to write better in English, Common Mistakes to Avoid. While using if not can elevate your writing, several common mistakes can detract from its effectiveness. Beware of the following pitfalls: Confusing it with “Unless”: If not and “unless” may seem similar, but they have distinct meanings.If not presents an alternative condition, while “unless” introduces a condition that prevents something from happening., "If no" can be used for yes/no questions on forms and in questionnaires, yes. In such cases it means "If your answer is no". I'm not sure whether this is the only context in which "if no" is acceptable: we native speakers aren't taught "rules" about this type of thing. What I can say is that I don't recall using or hearing "if no" in a conversation and can't think of a context in which it , I agree it's technically correct. The wordiness makes it appear not to be. If you simplify it, it doesn't seem so bad: "He remained alive, his death faked to avoid arrest.".