Putting text next to boostrap input not working - html

Question

So I have a form and I'm using the Bootstrap framework and on every input type of this form I want to have text on the left showing what the input is for but what happens the text gets above the input like this:
Picture of how forms looks like right now:
<div class="container">
<br>
<center> <h3> Jongere toevoegen </h3> </center>
<br>
<?php echo form_open('index.php/Addjongere/Add_jongere'); ?>
<form>
<div class="form-group row">
<label>Roepnaam:</label>
<input class="form-control" name="roepnaam" id="roepnaam" placeholder="Roepnaam" type="text">
</div>
<div class="form-group row">
<label>Tussenvoegsel:</label>
<input class="form-control" name="tussenvoegsel" id="tussenvoegsel" placeholder="Tussenvoegsel" type="text">
</div>
<div class="form-group row">
<label>Achternaam:</label>
<input class="form-control" name="achternaam" id="achternaam" placeholder="Achternaam" type="text">
</div>
<div>
<button class="btn btn-primary" name="Add_jongere" >Toevoegen</button>
</div>
</form>
</div>
Does anyone know what I can do?
Any kind of help is appreciated

Answer 1

Is this what you are trying to get? Remove the class="form-inline" from your form and to your form-group divs add class row.
I also added a container around the form to keep it in a good size.
edit
I forgot to add class="col-sm-4" to the labels and class="form-control col-sm-8" to the inputs. So they were not next to eachother.
label{
text-align: center;
}
h3, .container button{
display: block;
margin: 0 auto;
text-align: center;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<div class="container">
<h3> Jongere toevoegen </h3>
<br>
<form>
<div class="form-group row">
<label class="col-sm-4">Roepnaam:</label>
<input class="form-control col-sm-8" name="roepnaam" id="roepnaam" placeholder="Roepnaam" type="text">
</div>
<div class="form-group row">
<label class="col-sm-4">Tussenvoegsel:</label>
<input class="form-control col-sm-8" name="tussenvoegsel" id="tussenvoegsel" placeholder="Tussenvoegsel" type="text">
</div>
<div class="form-group row">
<label class="col-sm-4">Achternaam:</label>
<input class="form-control col-sm-8" name="achternaam" id="achternaam" placeholder="Achternaam" type="text">
</div>
<div>
<button class="btn btn-primary" name="Add_jongere">Toevoegen</button>
</div>
</form>
</div>

Answer 2

You can put the entire form inside a responsive col, and adjust the label/input widths accordingly...
https://www.codeply.com/go/vdQSHJUalP
<div class="container">
<div class="row">
<form class="col-12 col-md-8 mx-auto">
<div class="form-group row">
<label class="col-5 col-sm-3 text-truncate">Roepnaam:</label>
<input class="form-control col" name="roepnaam" id="roepnaam" placeholder="Roepnaam" type="text">
</div>
<div class="form-group row">
<label class="col-5 col-sm-3 text-truncate">Tussenvoegsel:</label>
<input class="form-control col" name="tussenvoegsel" id="tussenvoegsel" placeholder="Tussenvoegsel" type="text">
</div>
<div class="form-group row">
<label class="col-5 col-sm-3 text-truncate">Achternaam:</label>
<input class="form-control col" name="achternaam" id="achternaam" placeholder="Achternaam" type="text">
</div>
<div class="form-group row">
<div class="col-12 text-center">
<button class="btn btn-primary" name="Add_jongere">Toevoegen</button>
</div>
</div>
</form>
</div>
</div>

Answer 3

try this:
.formcontrol {width: 50%; float:right;}