WP if condition showposts - wordpress

Question

I have this code which works okay for what I wanted but I will probably need to put a condition if there's only 2 posts then wrap it in a <div class="large-6"> then if there's 3 posts then wrap it in large-4.
Just a little confused how to add a condition statement.
<?php
$loop = new WP_Query( array( 'post_type' => 'portfolio', 'showposts' => '3', 'offset' => '1' ) );
?>
<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
<div class="large-4 columns">
<h5><?php the_title(); ?></h5>
<?php edit_post_link(); // Always handy to have Edit Post Links available ?>
<?php if ( has_post_thumbnail()) : // Check if thumbnail exists ?>
<?php echo get_the_post_thumbnail(); ?>
<?php endif; ?>
</div>
<?php endwhile; ?>
To Pieter:
something like this? if so, that didn't work though unless I'm doing it totally wrong and noobishly.
<?php
$query = new WP_Query(array(
'posts_per_page' => '3',
'post_type' => 'portfolio',
'offset' => '1'
));
while ($query->have_posts()): $query->the_post(); ?>
<?php if(!isset ($query->posts[2])){ ?>
<div class="large-6 columns">
<h5><?php the_title(); ?></h5>
<?php edit_post_link(); // Always handy to have Edit Post Links available ?>
<?php if ( has_post_thumbnail()) : // Check if thumbnail exists ?>
<?php echo get_the_post_thumbnail(); ?>
<?php endif; ?>
</div>
<?php } else {?>
<div class="large-4 columns"> </div>
<?php }?>
<?php endwhile; ?>

Answer 1

This is just a theory but should work. Here is the idea:
$loop->posts holds an array with all the posts with all their resepective postdata. So, with that in mind, it should be easy to determine whether you have one, two or three posts in that array by simply checking if a certain array key exists
So you basically needs to check if you have a third post, so you can try something like this
if( !isset( $loop->posts[2] ) ) {
//add div if less than 3 posts
}else{
//add div if you have 3 posts
}
EDIT
Just a note. The OP has changed the query variable from $loop to $query in his original code. $loop should be changed accordingly

Answer 2

You can put conditionals like
<?php if(condition) : ?>
code to execute if condition == true
<?php elseif(condition2) :?> // repeat as many times as necessary
...
<?php else :?>
final else if needed, you can just end the if statement if it's only one condition, if you have else if else this is needed
<?php endif; ?>
That's basically it...