1. Look at the color: After the corn has been boiled for a period of time, open the pot and see if the color of the corn has changed. The color of the corn before cooking is relatively light, and the color of the corn after cooking is darker, golden yellow, which means that the corn is cooked.

2. Touch and feel: Peel off a kernel of corn with your hands. If the corn kernel is relatively hard and not hollow, and no juice splashes out when you pinch it, it means that the corn has been cooked. Juice, then it means it is not cooked yet.

3. Taste the corn: Taste the corn yourself. If the texture is very soft and waxy, and there is no cornstarch texture inside the corn kernels, it means the corn is ripe. If the corn is not fragrant, the texture is not soft. If it is glutinous and has a cornstarch smell, it means the corn is not cooked at all.