<i>We can't do this alone, <u>not without him</u>.</i><br/><br/><i></i><br/><br/>The underlined phrase can't be a second adverbial (<i>alone, without him</i>) because it would be a double negative, right? <br/><br/><br/><br/>Are we to treat it as an ellipted second main clause? (<i>We can't do this alone; we can not do this alone without him).</i><br/><br/><br/><br/><br/><br/>Thank you