a new class of rude people has been born...是被动句吗

a new class of rude people has been born...是被动句吗 是has还是have?A lot of advice has/ have been offered by people? To make a lot of noise in class is rude.同义句 She has been eating a cake改被动句! A new world champion(冠军)has been born.(根据首字母写单词) he has been married for three years 句中has been married 是被动语态 a new a____ to teaching languages has been used in our class It's a pity that theconcert has been cancelled.是被动语态吗? i was born of a working-class Class three has a map of China改为同义句) Our class has a mop of China改为同义句 she has been pronounced out of danger.这是现在完成时的被动态吗（有这种时态吗）