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There technically is no «tu» imperative for the verb «chover» and «nevar», etc. It is one of those impersonal third-person verbs, just like in English it is impersonal (because what does the "it" refer to in "It is raining." Nothing, really. That's why it is impersonal.) Have a look here: http://www.conjuga-me.net/verbo-chover. The only correct/true conjugations of this verb are the ones that are not faded-out. Because the conjugation pattern exists, one can easily still fill in the whole conjugation chart, but it is one of those gray-area verbs. There aren't too many like them. :)