1. On the party, I spoke to my sister.

2. Teacher allow me to speak in the classroom.

3. May I speak to sb.？

4. I want to have a talk with him alone.

5. Don't ever with a pure SB to speak, because he will pull you to the same level.

这些例句展示了"speak to sb"这个短语在不同情境下的用法，包括日常对话、课堂环境和电话交流等。希望这些例句能帮助你更好地理解和使用这个短语。