If incorrect, then what's the correct statement?

closed as off-topic by tchrist Dec 30 '18 at 5:47

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Proofreading questions are off-topic unless a specific source of concern in the text is clearly identified." – tchrist
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A lot has happened or A lot has been happening, I think.

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