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I have written down the sentences below.
(1a) Next week, we will be celebrating our company
's eighth birthday. (my sentence)
(1b) Next week, we will be celebrating our company eighth birthday. (my friends' revised sentence)

(2a) Next week, we will be celebrating our company's eighth anniversary. (my sentence)
(2b) Next week, we will be celebrating our company eighth anniversary. (my friends' revised sentence)

May I ask two questions?

(A) My non-native English speaking friends removed the possessive from the word, company. Is it wrong to have it?
(B) Is it okay to use "birthday" as an alternative word for "anniversary"?

Thank you very much for your time and help.

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Only

our company's eighth anniversary

is possible.

(Only people have birthdays — and maybe their pets.)

CJ

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I have written down the sentences below.
(1a) Next week, we will be celebrating our company
's eighth birthday. (my sentence) correct
(1b) Next week, we will be celebrating our company eighth birthday. (my friends' revised sentence) Incorrect

(2a) Next week, we will be celebrating our company's eighth anniversary. (my sentence) correct
(2b) Next week, we will be celebrating our company eighth anniversary. (my friends' revised sentence) incorret

May I ask two questions?

(A) My non-native English speaking friends removed the possessive from the word, company. Is it wrong to have it? You need it.
(B) Is it okay to use "birthday" as an alternative word for "anniversary"? No, don't say birthday,

unless you are deliberately trying to write in a cute and childish manner.

People have birthdays. Companies have anniversaries.

eg the anniversary of the founding of our company.

Clive