<li>One result of the fire department’s new contract is that they can no longer offer overtime pay on weekends</li>
</ol>
<p>fire department is singular right? so it should be “…it can no longer offer overtime pay” ?</p>
<li>Crossing and recrossing the stream, stepping on or over slipper rocks, and following a trail that grew steeper and steeper, the hikers soon realized how challenging their day would be. </li>
</ol>
<p>The answer is no error, can someone explain why? In particular, I don’t understand why it’s “that grew” rather than “that was growing”</p>