Hello there!
Does English grammar allow using present perfect and past perfect tenses in one sentence? For example:
I've just noticed that I'd skipped one of your messages before I went out. I've just listened to it.
Thank you.
Yes. The sentence is fine as is. The noticing is in the recent past (and carries into the present).
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Yes. The sentence is fine as is. The noticing is in the recent past (and carries into the present). The missing of the messages is in the past (and is over). So, both present and past perfect.