1. I had better put less food on my plate tomorrow.

2. I had better put less food on my dish tomorrow.

3. I had better put less food on my bowl tomorrow.
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What is the difference among 'plate,' 'dish' and 'bowl?
Are 'plate' and 'dish' the same in shape?

Plate and dish are the same shape, yes ... neatly flat. The preposition "on" is correct for these.

http://www.designhousestockholm.com/collection/download/Blonde_Plate_sand.jpg

Bowl, however, is different, and the preposition "in" is needed.
http://upload.wikimedia.org/wikipedia/commons/6/61/Simple-ceramic-bowl.jpg

The words 'plate,' 'dish,' and 'bowl' refer to different types of tableware, and there are slight differences in their shapes and uses.

1. Plate: A plate is a flat, round or oval-shaped dish that is usually wider and shallower than a bowl. Plates are typically used for serving main courses, such as meat, vegetables, or pasta. They can also be used for appetizers, bread, and desserts. Plates are often made of ceramic or glass and can come in various sizes and designs.

2. Dish: The term 'dish' is more general and can refer to various types of tableware, including plates. However, 'dish' can also include other types, such as serving dishes, casserole dishes, or side dishes. In terms of shape, a dish can be similar to a plate, but it can also have different designs, shapes, or functions.

3. Bowl: A bowl is a deep, rounded container that is wider at the top than at the base. It has higher sides than a plate or dish. Bowls are typically used for serving foods that contain liquids or semi-liquids, such as soups, stews, cereals, or salads. Bowls can be made of ceramic, glass, or other materials.

So, while plates and dishes can have similar shapes, a dish is a more generic term that can include plates, while bowls have a distinct deep and rounded shape specifically designed for serving foods with liquids or semi-liquids.

To see the difference in shape, you can search for images of plates, dishes, and bowls on the internet. You can also visit a local kitchenware store or look at different types of tableware you may have in your own kitchen.