<p><span>1.) We have lived in California <strong>since</strong> 1994.</span></p>
<p><span>2.) <span>Tina has been married <strong>for</strong> three years.</span></span></p>
<p><span><span>3.) <span>I have worked here <strong>for</strong> a long time.</span></span></span></p>
<p><span><span><span>4.) <span>Robert hasn't smoked <strong>since</strong> his birthday.</span></span></span></span></p>
<p><span><span><span><span>5.) <strong>Since </strong><span>1998, Arthur Holt has been the president of our club.</span></span></span></span></span></p>
<p><span><span><span><span>6.) <span>They have studied Spanish <strong>for</strong> six weeks.</span></span></span></span></span></p>
<p><span><span><span><span><span>7.) <span>Nobody has seen Peter <strong>since </strong>Christmas.</span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>8.) <span>Paula has worked here <strong>since</strong> March 2000.</span></span></span></span></span></span></span></p>
<p><span><span><span><span><span><span><span>9.) <strong>For</strong> three days, George has been telling the same old jokes.</span></span></span></span></span></span></span></p>
<p><span><span><span><span><span><span><span>10.) John has lived here <strong>since</strong> his divorce.</span></span></span></span></span></span></span></p>