Final answer:
To correct the statement, it should read 'The trophy that is on the shelf is not mine,' eliminating the apparent typo 'additive' and using 'that' to clearly identify the subject of the sentence.
Step-by-step explanation:
To correct the phrase 'The additive the trophy which is on the shelf is not mine', we should clarify the intended meaning. It appears the sentence is attempting to communicate that a specific trophy on a shelf does not belong to the speaker. The correct sentence would be 'The trophy that is on the shelf is not mine'.
Grammar, punctuation, and word choice are critical in ensuring the sentence conveys the right message. In this instance, 'additive' seems to be a typo and should be omitted, while 'that' is used to introduce the clause identifying which trophy the speaker is referring to. This correction adheres to standard English sentence structure and clearly defines the ownership of the trophy.