对话内容：

A： What are your plans for this weekend?
       B： I don't know. It would be good to do some sports.
       A： That's a good idea. I need to take some exercise and keep fit.
       B： How about a game of tennis? Would you like to play tennis?
       A： Yes, I'd love to. It's ages since I've played.
       B： That's no problem. It's been a long time since I've played, too.
       A： Good. I know a club where we can play.

语言点解析：

1. 询问他人未来计划：
              你可以通过以下两种方式询问某人的未来计划：
              What are your plans for this weekend?（你这个周末有什么计划？） 或者 What are you doing this weekend?（你这个周末做什么？）

2. 表达可能性：
              在讨论可能性时，你可以使用 It would be good to...，例如：
              It would be good to do some sports.（做些运动的话会不错。）

3. 提出建议：
              提出建议时可以使用 How about...?，例如：
              How about a game of tennis?（打网球怎么样？）
              或者 How about going to the Thai restaurant tomorrow?（明天去泰国餐馆怎么样？）

4. 表达“很久没做某事了”：
              如果你很久没有做某事了，可以使用以下句型：
              It's ages since... 或者 It's been a long time since...
              例如：
              It's been a long time since I've played tennis.（我已经很长时间没打网球了。）

常用句型总结：

• What are your plans for this weekend?（你这个周末有什么计划？）

• What are you doing this weekend?（你这个周末做什么？）

• It would be good to do some sports.（做些运动的话会不错。）

• How about a game of tennis?（打网球怎么样？）

• It's been a long time since I've played tennis.（我已经很久没打网球了。）

扩展练习：

在日常对话中，运用这些句型进行自我扩展，练习与朋友或同事之间的互动。例如：
       A：What are your plans for this weekend?
       B：I think I'll go hiking. How about you?
       A：I'm planning to meet some friends. How about doing some sports together?