It's bad manners to ( ) ( )嘲笑others

It's bad manners to ( ) ( )嘲笑others It is bad manners to point at others是什么意思 be bad manners to laugh at 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“ 你好 请问是it's bad manners of sb to do sth 还是 it's bad manners f Is it good manners to others'talking? 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 not good manners to la__ at others when they make mista