talab1234 4. I did not receive the item yet. That one is natural for a native speaker.
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talab12344. I did not receive the item yet.
That one is natural for a native speaker. The others are not.
Since the only difference is the positioning of "yet", the designation of "ungrammatical" may not be warranted, but "unnatural" or "awkward" certainly is.
Another way to express this idea is:
I have yet to receive the item.
talab12342. I did not receive yet the item.3. I did not receive yet, the item.
These are wrong.
talab12341. I did not yet receiv