And this is David. He’s from Toronto.
这位是大卫。他从多伦多来。
A I’ve got another friend coming in about 20 minutes. He might be running a bit late, but he’ll be here soon.
A 我还有一位朋友大约20分钟后到。他可能会晚到一会，但是他很快会到的。
B Who is he? Have we met him before?
B 他是谁？我们以前见过他吗？
A No, I don’t think so. He’s another guy who works with me. A Canadian.
A 不，我想没有。他是另一个和我一起工作的小伙子。一个加拿大人。
B I look forward to seeing him.
B 我期待着见到他。
A Here he is – he’s early. Let me introduce him. This is David. He’s from Toronto.
A 他来了——他提前到了。让我来介绍他。这位是大卫。他从多伦多来。
B Hi David. Glad you could come.
B 嗨，大卫。很高兴你能来。

Notes 注释
1 Remember the colloquial phrase to describe being a little bit late, especially if someone is busy, or something is delaying them, such as traffic, e.g.: He’s running a bit late / He’s running a bit late; The traffic is heavy so I’m running late / The traffic is heavy so I’m running late.
记住描述某人有点迟到时用的口语化短语，尤其是当某人很忙或者他被某事(例如交通阻塞)所耽搁的时候。例如：He’s running a bit late /他可能会晚到一会；The traffic is heavy so I’m running late /交通太拥挤了，所以我要迟到一会了。
2 If you are not sure and want to check if you’ve already done something, or met someone, or been somewhere, you can say: Have we met him before? / Have we met him before? ;Have we been to that restaurant before? / Have we been to that restaurant before?
如果你不肯定你是否已经做了某事或者见了某人，或者去过某个地方，而你想验证一下，你可以说：Have we met him before? / 我们以前见过他吗？； Have we been to that restaurant before? /我们以前去过那家餐馆吗？

Key phrases and sentences
I’ve got another friend coming in about 20 minutes. 
He might be running a bit late, but he’ll be here soon.
Who is he? Have we met him before?
No, I don’t think so. 
He’s another guy who works with me. 
A Canadian.
I look forward to seeing him.
Here he is – he’s early. 
Let me introduce him. 
This is David. He’s from Toronto.
Hi David. Glad you could come.

我还有一位朋友大约20分钟后到。
他可能会晚一点，但是他很快会到的。
他是谁？我们以前见过他吗？不，我想没有。
他是另一个和我一起工作的小伙子。
一个加拿大人。
我期待着见到他。
他来了——他提前到了。
让我来介绍他。这位是大卫。
他从多伦多来。
嗨，大卫。很高兴你能来。