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I was extremely surprised and am grateful for you all celebrating Mallory’s and my special day.

closed as off-topic by sumelic, tchrist Sep 9 '16 at 2:22

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." – sumelic, tchrist
If this question can be reworded to fit the rules in the help center, please edit the question.

  • Hello, welcome to English Language and Usage SE! Please be aware that proofreading questions are not on-topic for this site. We will be able to answer your question if you can specify a particular part of the sentence (grammar or word usage) that you are unsure about. – sumelic Sep 8 '16 at 23:38
  • If the part you are unsure about is "Mallory's and my," you might find the answers to the following question useful: What possessive forms are used for mutual 1st person ownership? – sumelic Sep 8 '16 at 23:39
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I was extremely surprised and am grateful for you all celebrating Mallory’s and my special day.

It is incorrect.

You switch verb tense from past tense to present tense: was surprised to am

Keep am by making it a Compound Sentence.

"Mallory’s and my special day" = correct =

When on of the words showing joint possession is a pronoun, both words should be possessive in form: Peggy's and my bookcase [not Peggy and my bookcase]

—John E. Warriner. Warriner’s English Grammar and Composition. Third Course. Liberty Edition. Orlando, Florida: Harcourt, Brace, and Jovanovich. 1986. 825.

CORRECT:

I was extremely surprised, and I am grateful for you all celebrating Mallory’s and my special day.

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