If statement in twig

Is possible to make an if statement in twig syntax and depending of the result close the html tag in a way or another. For example:

<button name="button" class="btn btn-warning"
    {% if someCondition == false %}

        > {#if is false close the button tag#}

        <i class="fa fa-gift"></i><strong> Welcome<br />Present</strong>
    {% else %}

        disabled="disabled">{#if is true disable the button tag and then close#}

        <i class="fa fa-gift"></i> Welcome<br />Present
    {% endif %}
</button>

Thanks in advance.

-UPDATE-

Sorry I made a silly mistake, I was doing the right thing but in the wrong place that's why it did not reflected on my site. Thanks anyway (: