If the Cambridge Dictionary really did that, it's a misprint, but I think it more likely that you misread it. That is what I suspect, because all of your sentences are wrong or strange. Please copy and paste the Cambridge entry on this thread so we can have a look at it.
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92MichaelWhen to use become,becomes and became?"become" is a verb like any other. There is nothing special about it.
Which is correct: You, our customer, becomes part of our story OR you, our customer, become part of our story?