<h2 class="western"><span><span>Have To</span></span></h2>
<p><span><span><span>"Have to" is used to express certainty, necessity, and obligation.</span></span></span></p>
<p><span><span>Examples:</span></span></p>
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<p><span><span>This answer</span></span><span><span> </span></span><strong><span><span>has to</span></span></strong><span><span> </span></span><span><span>be correct.</span></span><span><span> </span></span><em><span><span>certainty</span></span></em></p>
</li>
<li>
<p><span><span>The soup</span></span><span><span> </span></span><strong><span><span>has to</span></span></strong><span><span> </span></span><span><span>be stirred continuously to prevent burning.</span></span><span><span> </span></span><em><span><span>necessity</span></span></em></p>
</li>
<li>
<p><span><span>They</span></span><span><span> </span></span><strong><span><span>have to</span></span></strong><span><span> </span></span><span><span>leave early.</span></span><span><span> </span></span><em><span><span>obligation</span></span></em> </p>
</li>
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<p><span><span><span>Modal Use</span></span></span></p>
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<p><span><span>Positive Forms<br />1. = Present   </span></span></p>
<p><span><span>2. = Past   </span></span></p>
<p><span><span>3. = Future</span></span></p>
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<p><span><span>Negative Forms<br />1. = Present   </span></span></p>
<p><span><span>2. = Past   </span></span></p>
<p><span><span>3. = Future</span></span></p>
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<p><span><span>Also use:</span></span></p>
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<p><span><span><span>have to</span></span></span><span><span><span> </span></span></span><span><span><span><br /></span></span></span><em><span><span><span><strong>certainty</strong></span></span></span></em></p>
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<p><span><span><span>1. That has to be Jerry. They said he was tall with bright red hair.</span></span></span></p>
<p><span><span><span>2. That has to have been the right restaurant. There were no other restaurants on the street.</span></span></span></p>
<p><span><span><span>3. NONE</span></span></span></p>
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<p><span><span><span>1. SHIFT TO "MUST"</span></span></span><span><span><span> </span></span></span><span><span><span><br />That must not be Jerry. They said he has blond hair, not red hair.</span></span></span></p>
<p><span><span><span>2. SHIFT TO "MUST"</span></span></span><span><span><span> </span></span></span><span><span><span><br />That must not have been the right restaurant. I guess there was another one around there somewhere.</span></span></span></p>
<p><span><span><span>3. NONE</span></span></span></p>
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<p><span><span><span>must,<br />have got to</span></span></span></p>
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<p><span><span><span><strong>have to</strong></span></span></span><span><span><span><strong> </strong></span></span></span><span><span><span><strong><br /></strong></span></span></span><em><span><span><span><strong>necessity</strong></span></span></span></em></p>
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<p><span><span><span>1. She has to read four books for this literature class.</span></span></span></p>
<p><span><span><span>2. She had to finish the first book before the midterm.</span></span></span></p>
<p><span><span><span>3. She will have to finish the other books before the final exam.</span></span></span></p>
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<p><span><span><span>1. She doesn't have to read "Grapes of Wrath." It's optional reading for extra credit.</span></span></span></p>
<p><span><span><span>2. She didn't have to write a critique of "The Scarlet Letter." She had to give a presentation to her class.</span></span></span></p>
<p><span><span><span>3. She won't have to take any other literature classes. American Literature 101 is the only required course.</span></span></span></p>
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<p><span><span><span>must</span></span></span></p>
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<p><strong><span><span><span>REMEMBER: "Do not have to" vs. "Must not"</span></span></span></strong><span><span><span><strong> </strong></span></span></span><span><span><span><br />"Do not have to" suggests that someone is not required to do something. "Must not" suggests that you are prohibited from doing something.</span></span></span></p>
<p><span><span>Examples:</span></span></p>
<ul>
<li>
<p><span><span>You</span></span><span><span> </span></span><strong><span><span>must not</span></span></strong><span><span> </span></span><span><span>eat that.</span></span><span><span> </span></span><em><span><span>It is forbidden, it is not allowed.</span></span></em></p>
</li>
<li>
<p><span><span>You</span></span><span><span> </span></span><strong><span><span>don't have to</span></span></strong><span><span> </span></span><span><span>eat that.</span></span><span><span> </span></span><em><span><span>You can if you want to, but it is not necessary.</span></span></em></p>
</li>
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