The grammar in a minute. Right now, it is the sense of what is being said that interests me. I don't think you can say "notice" when you are not noticing it--you are being i nformed.
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Doctor DNow for your examples:I haven't seen him before. (I am seeing him now...so we have a present time link).I have never heard such rubbish before. (You are telling me something that I now think is rubbish--so, again, a present time link).Does this help?Yes, thank you very much, it helps, but that "heard" example . . . Maybe I should have used a slightly