Hi,<br/><br/><b>Background:</b><br/>From previous posts, I understand that the following 2 sentences are grammatically correct and have the same meaning.<br/><br/><b>Question:</b><br/>In this post, could you please tell which sentence would be said or preferred by a native speaker?<br/><br/><b>Sentence1:</b><br/>I solved the problem <span style="color:rgb(0,0,255);"><b>that</b></span> the classes <span style="color:rgb(0,0,255);"><b>were</b> <b>not</b></span> long enough.<br/><b>Sentence2:</b><br/>I solved the problem <b><span style="color:rgb(0,0,255);">of</span> </b>the classes <span style="color:rgb(0,0,255);"><b>not being</b></span> long enough.<br/><br/>Thanks