<div class="row">
  <div class="col-xs-12  col-md-4">
    [text* your-name placeholder "First Name"] 
  </div>
  <div class="col-xs-12  col-md-4">
    [text* last-name placeholder "Last Name"] 
  </div>
</div>
<div class="row">
  <div class="col-xs-12  col-md-4">
    [email* your-email placeholder "E-mail address"]
  </div>
  <div class="col-xs-12  col-md-4">
    [tel* your-phone placeholder "Phone Number"]
  </div>
</div>
<div class="row">
  <div class="col-xs-12  col-md-8">
    [text your-subject placeholder "Subject"]
  </div>
  <div class="col-xs-12">
    [textarea your-message placeholder "Message"]
    [submit class:btn class:btn-primary "SEND MESSAGE"]
  </div>
</div>