how to use across

why do u live ? or what do u live for ?

take a bus ,can we neglect a ,just say ,take bus . why we must add " a " between take and bus .

how to use how and what ,when to use . these wordds make me confused ,i don't know how to use them ,

how to say hope to be ur friend in itlalian .

whtat is difference between positvie and negative. sometimes ,we are positive ,but when some difficulty occur to us ,it will change everything ,how can i and u be a positive person . thank u see and think this question .

how to say' tu' in italian ?use the phonetic to note it ,thanks

can u help me ,give an englis name to du li jia

do u a popular person around your life ,tell me why ?