There means a place. For example: There is a good website for information called WikiAnswers.
Their means belonging to them. For example: Their homework was due tomorrow.
They're means they are. For example: They're going to look up information on WikiAnswers.
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'There' refers to a place, 'their' shows possession, and 'they're' is a contraction for 'they are.' Choose 'there' when referring to a location, 'their' when indicating ownership by a group, and 'they're' when combining 'they' and 'are' in a sentence.
You use "knows" if the subject is one person, other than yourself or the person or people you're speaking to. For example, he knows, she knows, or it knows. Otherwise, you generally use "know"; for example, I know, you know, we know, they know. Also, if you have a helper verb such as "do" or "does," then you always use "know"; for example, "Do you know the answer?" or "Does she know him?"
"Knew" is the past tense of "know." In the present tense, you would use "know" instead. For example: "I know the answer."
It seems like there may be a typo in your question. Did you mean to ask about "idiom," which refers to a phrase or expression that has a meaning different from the literal interpretation of the words used?
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
My friend forgot her possessive pronoun in her essay.