Leaves rustle gently.

Meaning: This means that the leaves of the tree are making a soft, continuous sound. It's like saying, The leaves of the tree are making a whispering sound.

Choice of Words: Leaves are the flat green parts that grow on the branches of a tree. Rustle is a verb that means to make a soft, continuous sound. Gently is an adverb that describes something that is done in a soft or careful way.