Tables

<table border="1">
    <tr>
      <td>Top-left cell</td>
      <td>Top-right cell</td>
    </tr>
    <tr>
      <td>Bottom-left cell</td>
      <td>Bottom-right cell</td>
    </tr>
</table>

<table border="1">
    <tr>
      <td colspan="2">This table data cell spans two columns.</td>
    </tr>
    <tr>
      <td>Bottom-left cell</td>
      <td>Bottom-right cell</td>
    </tr>
</table>

<table border="1">
    <tr>
      <td colspan="2">This table data cell spans two columns.</td>
    </tr>
    <tr>
      <td rowspan="2">This table data cell spans two rows.</td>
      <td>Middle-right cell</td>
    </tr>
    <tr> <!-- the tr stands for table row. -->
      <td>Bottom-right cell</td>
    </tr>
</table>

test out the examples above, then see if you can design the following table layouts: