It is [polite]for him to speak to the old than before

It is polite for/of you to do,哪个对? it is polite to do Is it polite for us to ask about a girl is age? Hi is polite and helpful.(改为否定句) It is polite ___( speak) to the old ______( polite). It is [polite]for him to speak to the old than before Hi is polite and helpful.(对polite and helpful提问)该怎么回答 用it is polite that.造句 It is polite ( ) in public places It is not polite. laugh at people Is it polite to eat noisily? it is polite to follow them it is polite a gift when you visit somebody for the first time A.take B.taking C.to take it is not polite to ( ) others when they are in trouble A get on well.it is not polite to others when they are in trouble.A get on well B smile at c wait for d laugh at it is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.it is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.A.for ,for B.for ,of C.of ,for D.of ,of --- .Is this bus for Yancheng ---No,it isn’t .It’s for Xuzhou.A.Hi B.Excuse me C.Sorry it's polite for you to leave w____ saying people it is not polite （） you to eat from other's plates?of or for?polite修饰You就是of，而修饰eat from...就应该用for 不是都对吗