Is Perfect Tense appropriate in "I have forgotten to post your letter."?

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I was supposed to answer the question "Did you post my letter?" I answered "No. I have forgotten to." It was a wrong answer. The right one was "No I forgot to."

Can I use Present Perfect there? On one hand since now I remember that I was supposed to post the letter, absent of this knowledge does not prolong up to now. But on the other hand, there is a consequence of my forgetfulness that is relevant now—the letter is not posted.

Graduate

Posted 2013-07-08T15:54:23.060

Reputation: 7 310

Answers

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I don't know who told OP that "No. I have forgotten to" was a "wrong answer", but it was bad advice.

Since the "forgetting" is still "relevant to the current moment", Present Perfect is grammatically/logically acceptable in such contexts.

But it is true that in practice most native speakers would use Simple Past "No. I forgot to", because very often the actual action described using Present Perfect continues into the present (i.e. - when you say "I have lived there all my life", it always means you still live there).

The tricky thing about forgetting to do something is that effectively it means you forgot about it. But as soon as you admit to having forgotten about it later, you're no longer forgetting. Because it creates a bit of semantic/temporal confusion, natives speakers tend to avoid the implications of Present Perfect here.

FumbleFingers Reinstate Monica

Posted 2013-07-08T15:54:23.060

Reputation: 52 587

@StoneyB: I was heartened to find 190 hits in Google Books for I was surprised I had not expected, and only 52 for I was surprised I did not expect. Not really enough to be "statistically significant", but it agrees with my own gut feel on what people usually say. As to the reason, obviously I made that up as I went along. But it's nice to know it strikes a chord.

– FumbleFingers Reinstate Monica – 2013-07-08T21:01:09.563

...for completeness, I am surprised I had not expected - 3 hits. I am surprised I did not expect - 231 hits.

– FumbleFingers Reinstate Monica – 2013-07-09T02:06:09.260

I would only answer have forgotten to have you posted – mplungjan – 2013-07-09T09:49:13.660

@mplungjan: I'm surprised. Per my answer, I certainly don't think Present Perfect is "wrong" in OP's context, but I'd be pretty certain it's very much a minority usage. I'd normally only use it in contexts where I still don't remember something (i.e. - if I couldn't recall whether I'd posted the letter or not). But that interpretation is ruled out here by the fact that OP's example features *forgotten to [post the letter]*. – FumbleFingers Reinstate Monica – 2013-07-09T15:52:58.950