grammar - Present perfect for past action with present effect


If I seem tired, can I say: "I haven't slept last night"? If not, why have I been told that we use present perfect for actions that have present effects?



Answer



Why have I been told that we use present perfect for actions that have present effects? Because the present perfect is indeed an appropriate way to talk about a past action whose effects continue into the present. Examples:



  • I've bought an iPhone (want to see it?)

  • I've lost my keys (can you help me look for them?)

  • I've made a cake (would you like a piece?)


However, as soon as you use an expression of finished time, then the past simple must be used:



  • I bought an iPhone last week (want to see it?)

  • I made a cake before leaving for work this morning (would you like a piece?)


The past simple is needed also when the finished time is not explicitly stated but implied:



  • I bought an iPhone in Tokyo (want to see it?) [You are back in London after your trip to Japan.]

  • I lost my keys while cleaning the basement (can you help me look for them?) [You are no longer cleaning the basement.]


"Rules" such as the one discussed here can be quite helpful to get English language learners started on the differences between English tenses, but good teachers will make it clear from the outset that actual usage is very much more complex.


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