Are the following sentences correct?
- John's opinion about the sports car shocked his friend.
- The Board of Director's opinion about the unresolved issue is that it should have already been dealt with long time ago.
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An apostrophe declares the origin and ownership of the particular object following that subject, correct? An opinion, while abstract in the physical sense, is still an object/noun, so in your examples, John has an opinion that is his. The apostrophe is correct in claiming John's opinion as his.