knw everything?

i really cn't stand when someone talking like they know everything . izh. when i say this. then she say. huhh? what? then suddenly say oee yeah2. shity. pretending to knw. when i ask her again. she just stood up. blurrr* stupiakks. SO . when u dn't knw. say it. dnt just acting like u knw it . that was annoying. u knw ? and it would be better if u ddnt say anything . just listen. listening can make u understand bout it . ok?