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Possible Duplicate:
When do I use present perfect tense instead of the simple past?
“Did you find” versus “have you found”

The first sentence hasn't specified time, but I have seen it.

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    Either is possible. It depends on the context. Jan 16, 2013 at 5:03
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    Visit and join ESL area51.stackexchange.com/proposals/41665/…
    – Kris
    Jan 16, 2013 at 6:56
  • Please have a look at the linked questions. The first one provides a general overview of how the different tenses in English correspond to one another. The second one, and the related questions linked from there, address your question more directly. Lastly, the third one addresses an important difference between British and American English.
    – RegDwigнt
    Jan 16, 2013 at 9:46

1 Answer 1

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The perfect tense, used in the second sentence, indicates something done in the past, which has a continuing effect on the present. To ask the first could mean nothing, as their hands could have been washed yesterday, or maybe even today and are now dirty. The second, however, is much more effective in interrogation.

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