1. While 约会 was defined in this lesson as meaning “date” it can also be used to describe a general appointment or engagement.
2. We have seen 普通 before in 普通话. In the sentence 听起来很普通 the speaker is stating that what she’s hearing sounds normal, and not very special.
3. 再来 is a new conjunction that hasn’t been used before.
4. We introduced the 的话 construction previously. Here we saw 如果是我的话 which roughly means “If I was in this situation.”
5. 打球 can be used to say “play sports” in general.
6. 玩 is used a lot more liberally in Chinese than it is in English as shown in: 所以你可以带她去海边玩水. Also in this sentence you can see the construction 带 X 去 Y.