How to write the composition 400 of potherb feast?

Today, my grandparents and I went to grandma's house by bus. My grandmother's house is in the countryside. We arrived at her home by bus for about two hours. As soon as I arrived at her house, I couldn't wait to go up the mountain with her to dig wild vegetables. After chatting with her for a while, she took me up the hill. Grandma took a pick and I took a shovel. When I got to the mountain, grandma told me what wild vegetables I could eat. I learned to distinguish wild vegetables. I found a little garlic in the middle of the wild vegetables, which looked interesting. At first, I thought it was nothing, and it was pretty good to dig. But as soon as I dug, I dug another one and it broke. Grandma looked at me and smiled and said, "Silly boy, put the shovel down." "Grandma gave me an exam on how to dig, and I also learned to dig with my grandmother. It really works. I dug up a batch of small garlic and looked at the fruits of my labor, and I felt an indescribable joy in my heart. It's almost noon. Grandma asked me and grandma to go home and eat at the foot of the mountain. Grandma and I went down the mountain happily with the fruits of our labor. Grandma praised me as a capable child. When I got home, my grandmother saw that the wild vegetables I was holding were dug by myself and happily held me in her arms. She said: My eldest grandson is really a sensible boy who knows how to help adults. Then grandma helped me and grandma wash their hands. At this time, I found that my hand was a little sore. My grandmother took a look and said sadly, silly child, blow it for you and you won't hurt. I looked at my grandmother and giggled and said, It doesn't matter if you are a man. Grandma held my injured little hand and smiled. Grandpa and grandpa heard my conversation with grandma and praised me as a good boy.