Is "It is they" grammatically correct? Or should we say "It is them"?

Can it possibly be correct to say "It is they"? Yes, it is, but there is also a more natural and equally correct way to say the same thing: "It is them." Here's why! Curious how grammar can be cozy? Try our FREE course on grammar & creativity: www.cozygrammar.com/intro/
Since 2001, Cozy Grammar has helped over 10,000 students in more than 27 countries to bring English to life and to open new doors of opportunity.
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Here's more on cases, including a handy memory trick! ua-cam.com/video/r_HuEZ4Qo4U/v-deo.html

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Blessings! Thanks for your expertise

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You're welcome!