Despite the fact that it is a tricky question, the solution is easy to remember. Despite being the possessive form of it, the word it's is actually a contraction of it is or it has. The two words mean completely different things! The most common thing people do is to take a course to learn English so that they can improve their grammar and speak English fluently. People mostly take https://iml.edu.pk/ to improve their grammar and speak English with more fluency. The apostrophe should be removed from the sentence if the is or has after it doesn't make sense.
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