以下の Matt と Sarah の会話には、can, could, can't, couldn'tが何度か出てきます。
Sarah: Matt, could you come here for a second?
Matt: Yeah, what is it?
Sarah: Can you see that little bird in the garden?
Sarah: In that tree, near the top.
Matt: Oh, yeah. I can see it.
Sarah: I couldn’t tell what it was, but I think it’s a wren, isn’t it?
Matt: I can’t really see it very well. It’s tiny. Let me get my binoculars.
Matt: (Looking through binoculars) That’s better. I can see it now.
Mm, it could be a baby robin. It’s got a slightly orange belly, hasn’t it?
Sarah: It could be. I’m not sure if I can see any orange, though.
Matt: I wish my nan was here. She could easily tell what it is.
Sarah: Yeah, she knows all the birds, doesn’t she?
Matt: I can take a photo and send it to her, can’t I?
Sarah: That’s a good idea. Hurry, it could fly away any minute.
Matt: I’ve got it.
Sarah: Oh, that’s a good photo! You could be a photographer!
Matt: I’m not that good!
Sarah: Do you think she can identify it?
Matt: Probably. I’ll send it to her.
Sarah: And send my regards to her, will you?
Three minutes later (after Matt’s nan replied) …
Matt: You were right. She’s quite sure it’s a wren.
Sarah: It’s so cute, isn’t it? I could watch it all day.