用手吃饭的英语表达为"eat with one's hands"或"eat with the hand". 这种说法源于英语中吃饭的常用表达是"eat with (one's) utensils"，其中"utensils"指的是餐具，包括刀叉勺子等。因此，为了表示不用餐具而用手吃饭，可以使用"eat with one's hands"这个表达。

例句：

I prefer to eat with my hands rather than using utensils.

我更喜欢用手吃饭，而不是用餐具。

In some cultures, it is considered rude to eat with one's hands.

在一些文化中，用手吃饭被认为是不礼貌的。

When I was a child, my parents taught me how to properly eat with my hands.

当我还是个孩子的时候，我的父母教我怎样用手吃饭。

Some foods, such as pizza and sandwiches, are designed to be eaten with the hands.

有些食物，比如披萨和三明治，就是设计用手吃的。