英语的,Knowing them will help you make a good impression.Having

英语的,
Knowing them will help you make a good impression.Having good table manners means knowing,for example.
She wants them to let her appear live on the air,hoping that Huike will see her.
这是高一课文里的,
请问第一句里两个Knowing分别是什么意思?第一个Knowing是什么用法?是什么词?当什么成分?这句主语是?
第二句里的appear 两个动词?