Yes, that is perfect English. You can also say, "I don't know whether it will rain tomorrow." In American English, you can also say, "I don't know whether/if it's going to rain tomorrow." All of these mean exactly the same thing. :)
5 Mayıs 2015
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Yes even your punctuation is good
5 Mayıs 2015
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!