The sentence can be extended to: (violent) wind (gently) shakes (huge) birch tree.
As the name implies, sentence expansion, also called writing expansion, is just the antonym of abbreviation. On the basis of the trunk, it adds branches and leaves, that is, according to the needs of expression, it adds joint components such as attributes, adverbials and complements to make the meaning of a sentence or text more specific and full.
Expand writing skills:
When expanding, we should add effective components reasonably according to the needs of expression, and do not pile up words with the same meaning, repeat them before and after, and do not change the meaning of the original sentence.
When completing the expansion homework or test questions, if there are specific provisions on the expansion part, it should be expanded according to the regulations. If there is no regulation, it can be expanded as a whole. Don't forget to punctuate the extension.