<p>1.) <span>You </span><span class="hl">mustn't</span><span> enter the park if your dog is not on a leash.</span></p>
<p>2.) <span>You </span><span class="hl">must / have to</span><span> respect the rules when you walk your dog in the park.</span></p>
<p>3.) <span>You </span><span class="hl">must not</span><span> allow your dog to run free.</span></p>
<p>4.) <span>You </span><span class="hl">must / have to</span><span> pick up your dog's poop (waste).</span></p>
<p>5.) <span>You </span><span class="hl">must / have to</span><span> take it away with you or throw it in the special garbage cans.</span></p>
<p>6.) <span>Of course, you </span><span class="hl">don't have to</span><span> walk your dog in the park. You can always go somewhere else.</span></p>
<p>7.) <span>You </span><span class="hl">must / have to</span><span> take it away with you or throw it in the special garbage cans.</span></p>
<p>8.) <span>You can always walk your dog in the fields, but even there you may </span><span class="hl">have to</span><span> use a dog leash.</span></p>