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Welcome? popular?

Posted by Nic on November 26, 2002

I am not a native English speaker and would like to ask for help. I am very confused by these two adjectives. Is there any possibility that these two can be used interchangeably sometimes? can you elaborate on this? (A) People who know art conversation are popular. (B) People who know art conversation are welcomed. (C) Showing off is not welcome. (D) He's a popular politician. (E) He's a welcome politician. 1.Do A and B mean the same thing? Or semantically, they're slightly different? What about (D) and (E)? 2.Can sentence C use "welcomed" too? If not, why not? Please help me out with these troubling questions. Thank you very very much.