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Sentence Correction: Tenses - Verb Forms

The CEO wants every person he has ever known attend the product launch event.

Incorrect.

While this answer choice corrects the original mistake, it creates a new one. Only the first verb of a sentence can be conjugated. Knows is conjugated - it is in the present form (V1). However, since it is not the first verb in the sentence, it should be unconjugated, that is, in the form of Verb+ing, To Verb, or the third form (V3).

Incorrect.

While this answer choice corrects the original mistake, it creates a new one. Only the first verb of a sentence can be conjugated. Knew is conjugated - it is the past form (V2). However, since it is not the first verb in the sentence, it should be unconjugated, that is, in the form of Verb+ing, To Verb, or the third form (V3).

Good!

This answer choice correctly uses an unconjugated verb (to attend) after the first verb in the sentence (has), which is, correctly a conjugated form.

Incorrect.

This answer choice repeats the original mistake. Only the first verb of a sentence can be conjugated. Attends is conjugated - it is in the present form (V1). However, since it is not the first verb in the sentence, it should be unconjugated, that is, in the form of Verb+ing, To Verb, or the third form (V3).

Incorrect.

This answer choice is grammatically incorrect. Only the first verb of a sentence can be conjugated. Attend is conjugated - it is in the present form (V1). However, since it is not the first verb in the sentence, it should be unconjugated, that is, in the form of Verb+ing, To Verb, or the third form (V3).

has ever known attend
has ever known attends
has ever known to attend
has ever knew to attend
has ever knows to attend