was sent back->is sent back

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@861 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter01/subscribe.xml

@@ -19,7 +19,7 @@ subscribe alfs-discuss</literallayout></blockquote>
 
 <para>After the email is sent, the Listar program will reply with an
 email requesting a confirmation of the subscription request. After
-this confirmation email was sent back, Listar will send an
+this confirmation email is sent back, Listar will send an
 email again with the message that the user has been subscribed to the
 list(s) along with an introduction message for that particular list.</para>