i am not able to put certain columns in the correct position in html talbes

I got two assignments from my school today and I wasn't able to replicate the images in html that our teachers gave us

Here is the first image:

and here's what I made:

and this is all the code:

<!DOCTYPE HTML>

<html>

<head>
    <title>
        pizza shop
    </title>
</head>

<body>
    <table border="1" cellpadding="11">
        <tr>
            <th colspan="4">Pizza Shop 2.0</td>
        </tr>
        <tr>
            <td>Name</td>
            <td><label for="name"></label>
                <input type="text" id="name" name="name"><br>
            </td>
        </tr>
        <tr>
            <td>Pizza topping</td>
            <td>
                <input type="radio" id="Supreme" name="Supreme" value="Supreme">
                <label for="Supreme">Supreme</label><br>
                <input type="radio" id="Vegetarian" name="Vegetarian" value="Vegetarian">
                <label for="Vegetarian">Vegetarian</label><br>
                <input type="radio" id="Hawaiian" name="Hawaiian" value="Hawaiian">
                <label for="Hawaiian">Hawaiian</label>
            </td>
        </tr>
        <tr>
            <td>Sauce</td>
            <td>
                <label for="Sauce"></label>
                <select>
                    <option value="Tomato">Tomato</option>
                    <option value="Pesto">Pesto</option>
                    <option value="Hummus">Hummus</option>
                    <option value="Buffalo sauce">Buffalo sauce</option>
                    <option value="Marinara sauce">Marinara sauce</option>
                </select>
            </td>
        </tr>
        <tr>
            <td>Optional extras</td>
            <td>
                <input type="checkbox" id="Extra Cheese" name="Extra Cheese" value="Extra Cheese">
                <label for="Extra Cheese">Extra Cheese</label>
                <input type="checkbox" id="Gluten Free Base" name="Gluten Free Base" value="Gluten Free Base">
                <label for="Gluten Free Base">Gluten Free Base</label>
            </td>
        </tr>
        <tr>
            <td colspan="4">Delivery Instructions:</td>

        </tr>
        <tr>
            <textarea id="Delivery Instructions" name="Delivery Instructions" rows="4" cols="50"></textarea>
        </tr>
    </table>
</body>

</html>

here's the second image:

and here's what I made:

and here's all the code:

<!DOCTYPE HTML>

<html>

<head>
    <title>
        Seminar
    </title>
</head>

<body>
    <table border="black" cellpadding="6" align="center">
        <tr>
            <th rowspan="2">Day</th>
            <th colspan="5">Seminar</th>
            <th colspan="2">Schedule</th>
        </tr>
        <tr>
            <th>Begin</th>
            <th>End</th>
            <th colspan="2">Topic</th>
        </tr>
        <tr>
            <td rowspan="2">Monday</td>
            <td rowspan="2">8:00 a.m</td>
            <td rowspan="2">5:00 p.m</td>
            <td>Introduction to XML</td>
        </tr>
        <tr>
            <td>Validity: DTD and Relax NG</td>
        </tr>
        <tr>
            <td rowspan="3">Tuesday</td>
            <td>8:00 a.m</td>
            <td>11:00 a.m</td>
            <td rowspan="2">XPath</td>
        </tr>
        <tr>
            <td>11:00 a.m</td>
            <td>2:00 p.m</td>
        </tr>
        <tr>
            <td>2:00 p.m</td>
            <td>5:00 p.m</td>
            <td>XSL Transformations</td>
        </tr>
        <tr>
            <td>Wednesday</td>
            <td>8:00 a.m</td>
            <td>12:00 p.m</td>
            <td>XSL Formatting Objects</td>
        </tr>
    </table>
</body>

</html>

I have tried to fix this many a time but i have ultimately failed that is why I have come to here to get answers

any help would be greatly appreciated