checkbox is not getting checked in angular js

<tr ng-repeat="languages in samln">
   <td>
      <span>{{languages.emplang}}</span>
   </td>
   <td>
      <input type="checkbox" name="checkbox1-" id="sp1" value="false" style="margin-left:40px;" ng-model="languages.speak">
   </td>
   <td>
      <input type="checkbox" name="checkbox2-" id="rea1" value="false" style="margin-left:40px;" ng-model="languages.read">
   </td>
   <td>
      <input type="checkbox" name="checkbox3-" id= "wr1" value="false" style="margin-left:40px;" ng-model="languages.write">
   </td>
</tr>

It has two string values true and false. I gave as value="false" but checkbox is not getting checked and Here languages is a list.