<p>1.) Last week we could swimming, this week we can't. (can/to go)</p>
<p>2.) Maybe the Smiths <span class="correct-input">will be able to build</span> a new house next year. (can/to build)</p>
<p>3.) If you try hard, you <span class="correct-input">can pass</span> your examinations. (can/to pass)</p>
<p>4.) When I was five, I <span class="correct-input">could not swim</span>. <span class="hint">(not/can/to swim)</span></p>
<p>5.) Dennis <span class="correct-input">could play</span> the trumpet after four months. (can/to play)</p>
<p>6.) Luke has passed his driving test, now he <span class="correct-input">can drive</span> a car. (can/to drive)</p>
<p>7.) I <span class="correct-input">could not speak</span> to him on the phone for three weeks last month. (not/can/to speak)</p>
<p>8.) Alex <span class="correct-input">will not be able to do</span> his homework when his desk is in such a mess. (not/can/to do)</p>
<p>9.) They were so busy, they <span class="correct-input">could not text</span> me. (not/can/to text)</p>
<p>10.) Lisa <span class="correct-input">has been able to clean</span> her dress. She can wear it again. (can/to clean)</p>