Hi everyone,<br/><br/>I wonder if the use of "to" is optional in the following sentence. This sentence was represented in a reading book without "to".<br/><br/>"Anyone who is au courant with the status of liberated women <b>need not be</b>/<b>need not to be</b> surprised by their entry into the boxing ring."<br/><br/>Thank you in advance,<br/><br/>Iman