Let's see who's the winner...

[kalingaraj]

The word yesterday makes all the difference here. It provides a time frame, and that makes all the difference. You can say I have seen him today, but you can't say I have seen him yesterday. I suppose the reason for that is that while saw refers to the past, have seen is about both the past and the present.
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kalingaraj
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I challenge you to a game of trivia! Click here to battle against me online at ConQUIZtador. Let's see who's the winner.... https://www.conquiztador.com/?a=26041

[heidita]

Sorry, Kali, the page doesn't open correctly.