你好 请问是it's bad manners of sb to do sth 还是 it's bad manners f

你好 请问是it's bad manners of sb to do sth 还是 it's bad manners f 为什么是it is good/bad manners to do sth. It's bad manners to ( ) ( )嘲笑others It’s good manners not to shout in public.It's bad manners __ It's bad manners to spit in public.主语是什么 I think it's bad manners to run---your parents It's bad manners to point at other people中为什么manners要加加”s“ 英语语法之定语It's bad manners to talk with your mouth full of food 三个英语问题1.it's (bad manners)/(a bad manner) to talk loudly.略答案 I think it bad manners to smoke in a reading room.为什么不用it's, It's bad manners to jump____ queue.A.a B.the C.an D./选A还是B?不 John,it's ____ bad manners to blow your nose at _____table