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Please look at the following sentences and tell me the difference between them.

  1. If you have met him today, then you must consider yourself lucky.

  2. If you met him today, then you must consider yourself lucky.

Also,

  1. Today, I've seen your friend talking to my neighbour.

  2. Today, I saw your friend talking to my neighbour.

Thank you.

marked as duplicate by user3169, ColleenV, Nathan Tuggy, shin, M.A.R. May 7 '16 at 11:15

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When using the present perfect, basically we're implying that the day is not over yet. So you could see someone talking in the morning, noon or night.

However, when using the past simple we imply that some period of the day ended, namely:

Today, I saw your friend talking to my neighbour.
(Earlier this morning, for example.)

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