I was talking recently with a friend who is in law school.

最近，我和一个在法学院的,朋友聊天时。

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Maybe you could be talking with another friend, who's very sad that the former friend is getting married.

可能你在和另一个朋友聊天，他对刚才那个朋友结婚的事感到难过。

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I love going out for dinner with some friends and having some really good conversation,

我喜欢和朋友出去吃饭，然后愉快地聊天，

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A third situation is when you're speaking with a friend.

第三种情况是，当你在和一个朋友聊天时，

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You can use the "What if" question when you're talking with a friend.

当你和一个朋友聊天时，你可以使用 “What if”问句。

What if 课堂 - SpeakingMax英语口语达人