The first one is unlikely. It is hard to think of a context in which intransitive "see" would be used like this. It is not an alternative to the second sentence.
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AlpheccaStars moginnYesterday we didn't seeWe were blind yesterday.I think "we couldn't see" would be more likely in that case?
moginnWhich one is right?Today we didn't see each other.Today we haven't seen each other.Both are fine sentences.
AlpheccaStarsBoth are fine sentences.Thanks for the answer, but this page http://www.englishpage.com/verbpage/presentperfect.html says the following about the present perfect: "Unspecified time before now. You cannot use the Present Perfect with specific time
moginnIs it correct to use both present perfect and past with expressions such as "this week", "this month" or "this year"?I haven't eaten this week/month/year.I didn't eat this week/month/year.Generally I would use the present perfect there. If I did use the simple past, it would only be right at the end of the time period (though in this case I doubt I woul