1. The trees are coming into leaf.

2. I was shaking like a leaf.

3. It's a maple leaf cake.

4. Is there a maple leaf in Canada's national flag？

5. Trees begin to have leaves in spring.

6. This plant has green leaves throughout the year.

7. I saw him take a leaf out of the book.

8. The leaves formed a dark green rosette.

9. The pond was choked with rotten leaves.

这些例句涵盖了"leaf"作为名词（叶子）和动词（长新叶）的不同用法，以及一些常见的短语搭配。希望这些例句能帮助你更好地理解和运用"leaf"这个单词。