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8 their x just means x belongs to multiple people. There is one exception relating to their, for which the oxford dictionary defines. For clarity and flow i would use the institution's in place of either its or their.

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If each of the their has an x, then you are talking about multiple xs, and should use the plural form of x.

Is it right to write “big corporations must work on their marketing strategies” in academic writing?

The general rule is that, when talking about things, you use its for singular and their for plural. If everyone in the their group. Our instructor said you can't use pronouns like 'their' in academic writing. What is the difference between their and theirs, and how is should use them?

3、their：their是复数第三人称的所有格形式,是复数形容词性物主代词,在句中只可用作定语,其后常接复数名词。有时为了避免显示性别, their还可代替his, her用作anybody, anyone, everyone. Their has an odd clumping effect as you intuit.