第1个回答 2011-07-19
It 's not polite to speak loud in public
It's fail to be polite to talk loud in public
loud 本身就是副词，所以不用loudly.
第2个回答 2011-07-19
It is not plite to speak loudly in public place.本回答被提问者采纳
第3个回答 2011-07-19
It isn't polite to speak loudly in public.
第4个回答 2011-07-19
It's not polite to speak loudly in public.