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谁 (shéi) is used to ask who someone is or who is doing something. For example, you can say "谁在做这件事?" (shéi zài zuò zhè jiàn shì?) which translates to "Who is doing this?".
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以前,以后,之前 and 之后 are used to indicate time. There are no obvious differences between 以前 and 之前, 以后 and 之后, except that 之前 and 之后 are more formal and are used more in written texts. Hope my response has been of help to you!
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