Como mudar layout de formulário no Twitter Bootstrap

O Bootstrap apresenta três layouts para formulários:

• Vertical (padrão) 
• Alinhado 
• Horizontal

Vertical

<form class="form-inline" role="form"> <div class="form-group"> <label class="sr-only" for="name">Nome</label> <input type="text" class="form-control" id="name" placeholder="Informe o Nome"> </div> <div class="form-group"> <label class="sr-only" for="inputfile">Arquivo</label> <input type="file" id="inputfile"> </div> <div class="checkbox"> <label> <input type="checkbox"> Opção 1 </label> </div> <button type="submit" class="btn btn-default">Confirmar</button> </form>

Alinhado
<form class="form-inline" role="form"> <div class="form-group"> <label class="sr-only" for="name">Nome</label> <input type="text" class="form-control" id="name" placeholder="Informe o Nome"> </div> <div class="form-group"> <label class="sr-only" for="inputfile">Arquivo</label> <input type="file" id="inputfile"> </div> <div class="checkbox"> <label> <input type="checkbox"> Opção 1 </label> </div> <button type="submit" class="btn btn-default">Confirmar</button> </form>

Horizontal
<form class="form-horizontal" role="form"> <div class="form-group"> <label for="firstname" class="col-sm-2 control-label">Nome</label> <div class="col-sm-10"> <input type="text" class="form-control" id="firstname" placeholder="Informe o Nome"> </div> </div> <div class="form-group"> <label for="lastname" class="col-sm-2 control-label">E-mail</label> <div class="col-sm-10"> <input type="text" class="form-control" id="lastname" placeholder="Informe o E-mail"> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <div class="checkbox"> <label> <input type="checkbox"> Lembrar de mim </label> </div> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-default">Entrar</button> </div> </div> </form>