"decide to do sth" 是一个常用的英语短语，意思是“决定做某事”。在这个短语中，"to do sth" 是一个不定式短语，表示将要执行的动作或决策。以下是一些使用这个短语的例子：

1. We decide to go to the beach for vacation.

2. They decided to adopt a new dog.

3. After careful consideration, she decided to pursue her dream of becoming a singer.

4. He decided to study abroad to further his education.

5. At this point, I don't care what you decide to do.

希望这些例子能帮助你更好地理解和使用 "decide to do sth" 这个短语。