Positive example: 1. The roosevelts were stolen. 2. Kangxi's 60th birthday. 3. Han Xin's meal is like 1000 yuan. Negative example: 4. Cao Cao killed Lv Boshe. Flowers and plants appreciate the sunshine, so before dawn, they condense crystal dew; The river is grateful to the earth, so it has flowed for thousands of years. When parents cook hot meals for us, we often say "thank you" instead of "thank you", but we don't like these foods. When teachers impart knowledge to us, what we often think about is not studying hard, but what games to play after class; When friends give us advice, we often don't think about the value of friendship, but about their interference. Roosevelt's house was stolen once, the house of former American President Roosevelt was stolen, and many things were stolen. When a friend heard the news, he wrote to comfort him and advised him not to care too much. Roosevelt wrote back to his friend and said, "Dear friend, thank you for writing to comfort me. I am safe now. Thank god: because first, the thief stole my things and didn't hurt my life; Second, the thief only stole some of my things, not all of them; Third, the luckiest thing is that he is the thief, not me. " Theft is unfortunate for anyone, but Roosevelt found three reasons to be grateful. On Kangxi's 60th birthday, he said to the civil and military officials of the Qing Dynasty, I am grateful to heaven and earth, to the ancestors of the Qing Dynasty, and to my opponents-they forced me to achieve great achievements, prosperity and peace, and they gave me an extraordinary life. But now that they are gone, let them be my enemies in the afterlife! I really need an opponent, Han Xin, the daughter of a rice grain, and Han Xin. He was poor when he was a child and his parents died. Although he studies hard and practices martial arts hard, he knows nothing about making money. As a last resort, he had to eat "free meals" at other people's homes. Because of this, they are often given the cold shoulder by others. Han Xin swallow not to descend this tone, went to the Huaihe River to fish, fish for food, and often had a hearty meal. On the Huaihe River, there is an old woman who washes yarn wadding for others, and she is called "Piaoniang". Seeing that Han Xin was starving, she gave him half of her food. Every day, without interruption, Han Xin vowed to repay her kindness. After Han Xin was named "Huaiyin Hou", she never forgot her wandering mother's kindness of sharing food, sent people to look around and finally gave her 1000 yuan. This is the origin of the idiom "a meal is worth 1000 yuan". Cao Cao killed Lv Boshe, assassinated Dong Zhuo and ran away. On the way through the sworn brother Lv Boshe's residence, Lv Boshe stayed here for one night. That evening, Lv Boshe went out to buy wine and ordered his family to kill pigs to entertain Cao Cao. Cao Cao heard the sound of sharpening the knife in the middle of the night, and heard the Lu family say, "Tie it first and then kill it." Cao Cao was suspicious and thought that Lv Boshe would harm him. So he rushed out with a knife and killed all the Lujia people! When I saw a pig tied up in the kitchen for slaughter, I realized that I had killed a good man by mistake. When Cao Cao left Lv Jia, he met Lv Boshe to buy wine. Lv Boshe said that he ordered his family to kill pigs and set wine for Cao Cao. Why did he leave so soon? I didn't expect Cao Cao to kill Lv Boshe with a knife. Colleague Chen Gong blames him for being disloyal. Cao Cao said, I would rather fail the whole world than let the whole world fail me. Chen Gong got a fright. So Chen Gong went to Zhang Xiu, and a kind mother took the thread and made clothes for her wayward son. Before leaving, I had a stitch for fear that my son would come back late and his clothes would be damaged. Who can say that a filial child like the weak can repay his mother's love like the sunshine in spring? Accept a drop of water when necessary, and I will repay your kindness with spring water. Crows have the intention of feeding back, and sheep know the grace of kneeling and nursing.