yes and no
... that English once had a four-form yes and no system, employed by Shakespeare and others, instead of the two-form system that it has today?
... that <a href="./English_language" id="mwB8k" rel="mw:WikiLink" title="English language">English</a> once had a four-form <b id="mwB8o"><a href="./Yes_and_no" id="mwB8s" rel="mw:WikiLink" title="Yes and no">yes and no</a></b> system, employed by <a class="mw-redirect" href="./Shakespeare" id="mwB8w" rel="mw:WikiLink" title="Shakespeare">Shakespeare</a> and others, instead of the two-form system that it has today?