For example, I was writing the following sentence:
"Sony donates 5% of profit to good causes."
How can I know that is necessary to use "its" in that sentence, as follows:
"Sony donates 5% of its profit to good causes"
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I would choose a third alternative. Use its. (See What is the best way to explain how to choose between "its" and "it's"?)
Sony donates 5% of its profit to good causes.