How to add excerpt in loop in Twenty Eleven theme?

Twenty Eleven uses already a conditional statement in content.php to show the excerpt in search results – 

<?php if ( is_search() ) : // Only display Excerpts for Search ?

edit this conditional to include the other templates where you want to show the excerpt;

example:

<?php if ( is_search() || is_home() || is_archive() ) : // Only display Excerpts for Search, Posts Page and Archives ?>

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