Choose the sentence that contains the error: 'Their going to launch the project next week.'

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This sentence tests correct pronoun and contraction usage. The word needed before a verb phrase like “going to launch” is the contraction for they are. So the sentence should read: They’re going to launch the project next week. Their is a possessive determiner used to show ownership (as in Their plan) and can’t precede a verb like going. Using There would also be incorrect here because there isn’t a location or existence context to support it. The contraction “they’re” fits the subject and the future action, and no extra comma is needed after “week.”