表示十分确信的说法有很多，仅仅sure一词就用法多多，比如be sure,quite sure, be dead sure三个表达确信的程度依次递进。后一个竟然用dead(死)来表达，足见确信程度之深。
熟人之间 A:Have you heard that John has fallen from the tall oak tree in the backyard? B: God!Is it serious? A: Believe it or not，he is as strong as a horse and he has nothing hurt. B :Are you kidding? A: No kidding!I saw it with my own eyes.
A:你听说约翰从后院的那棵橡树上摔下来了吗? B:天哪，严不严重? A:信不信由你，他毫发未损，体壮如牛呢。 B:你开玩笑吧! A:绝不开玩笑!我亲眼所见。
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