How can i get inverted coma instead of apostrophe in wordpress content frontend -

i write inverted comma on admin tinymce editor on frontend displays apostrophe when use:

the_content(); 

but when use

echo get_the_content(); 

it display inverted comma.

and when use

$content=get_the_content(); $content=apply_filters( 'the_content', $content ); echo $content = str_replace(']]>', ']]>', $content); 

it again display apostrophe instead of inverted comma.

i try replace apostrophe comma using

str_replace("’", "'", $content); 

it doesn't work. suggestions?

i have tried one

<?php $content = get_the_content();     $content = apply_filters( 'the_content', $content );     $content = str_replace(']]>', ']]&gt;', $content);     $content = html_entity_decode($content);//added code     echo $content = str_replace("’", "'", $content); ?> 

adding

$content = html_entity_decode($content); 

this code works me. still didn't know why wordpress convert.