<p>Were he to go somewhere, blahblah</p>
<p>Collegeboard uses somewhat alternative form of IF to test the test takers. </p>
<p>*What is this grammar called? and how do you use it? *</p>
<p>It’s not really a grammar rule. It’s just a slightly different way of phrasing the same thing.</p>
<p>Isn’t this the subjunctive? When a singular subject takes a plural verb to denote a hypothetical situation.</p>
<p>Yes. That is a subjunctive. It denotes a hypothetical situation. “I wish I were tall/cool/etc” Is also the subjunctive.</p>