A main form of China's modern new poetry. As the result of the May 4th literary revolution, it was closely related to the revolutionary changes of the content at that time, and the poetic form was liberated from the rigid meter of China's old-style poems. Writing in modern vernacular Chinese is not bound by external rhythm and syllables, and the style of poetry is not bound by any frame, and paragraphs, lines and words are not fixed. This is the embryonic form of free poetry that first appeared in the New Literature Movement. Therefore, although free verse is called a form, it has no specific poetic form, but it is just a general term for this kind of free verse. Since the eve of the May 4th Movement, some participants in the New Literature Movement have tried and explored free verse, and Hu Shi and others have made painstaking efforts to get rid of the influence of old poetry. It is Guo Moruo's Goddess that really breaks through the barriers of old poetry in content and form and shows the spirit of complete rebellion, which is the representative of China's free poetry collection towards independence. In the process of its emergence and development, free verse is obviously influenced by foreign poetry, such as Whitman's poetic style in the United States has a great influence on the creation of Guo Moruo and others, and Tagore's poetic sentiment in India has also been accepted by many people. Zhu Ziqing divided the poems before the May 4th Movement 10 into three schools: free verse, metrical verse and symbolic verse, and fully expounded and affirmed the free verse. During the Anti-Japanese War, due to the advocacy of Ai Qing and Tian Tian, free verse gained great prosperity. Ai Qing's view on the prose beauty of poetry further explains the existence of free verse in theory. "Call poetry out of the silent study and solemn pulpit, let it be honed in the people's suffering and struggle, and sing today and tomorrow for the people with a simple, natural, clear and sincere voice: this is the fighting tradition of China's free poetry." Limerick is an old-fashioned poem, that is, humorous poem. Content and writing are popular and humorous, not limited to flat rhythm. According to legend, it was created by Zhang Dayou in Tang Dynasty. According to Yang Shen's Collection Outside Sheng 'an Temple in the Ming Dynasty, Zhang Da's snow poems in the Tang Dynasty include "Jiangjun River, a hidden cave cage on the well." The yellow dog is white and the white dog is swollen. It's all slang. It's quite humorous. Later generations called this kind of poem "doggerel". Therefore, it can be seen that free verse is a new poem, which does not follow the rules of old-style poetry, and there is nothing to say in five or seven sentences, so it is written casually. However, limerick is still an old poem. No matter what the content is, it must follow the format of five or seven words.