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Grammar: How to use IF and WHETHER properly

Today's lesson is a grammar lesson. People often ask the difference between  whether  or  if . In some situations, If and whether are interchangeable, but the best way to not make a mistake, not to mix them up in the wrong situation is to Always use if for conditionals and use whether when you are talking about two choices. IF and WHETHER can be interchanged  in some cases: 1. When they are used as noun clauses, they can be interchanged. But try to avoid using them the same if you don't want to make the mistake. Ex:  Do you know  if/whether  Dan is coming? Note: you could add 'or not' with whether which is optional as whether already gives you a choice in this situation. Ex:  I don't know whether/ if the exam is on Friday or Saturday Note:  In the example above, if and whether seem to mean the same thing, but You need to remember IF is not limited to 2 options, but Whether is. Whether gives you 2 choices. More Examples: 1. Let me know if you are c