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کامپیو تر و IT
  
 نکات مفید کا مپیوتر و تدریس زبان انگلیسی
 
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1385/05/31
English teach - unit 1

       Common Mistakes in English

 
Don't have to = Do not have to We have to use don't have to to say that there is no obligation or necessity to do something.
For example: "You don't have to do the exercises at the end of this page."
Mustn't = must not is a modal verb used to show that something is not allowed. When you use mustn't you are telling people not to do things. It has the same force as don't , as in: Don't do that!
For example: " You mustn't drink if you're going to drive." 


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