I have been study all day.all的前面不需要加介词吗

I'll study IT-just which I have been dream about为什么把which改为what? I have been study all day.all的前面不需要加介词吗 have been的时态.I've been (studying) English for 3years.为什么用studying而不是to study I have been studying English和I have been learning English意思一样不 这其中learn和study能互换吗 but i have to study I have to study very I have to study chinese. I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. I appreciated () the opportunity to study abroad two years aog.A .having been given B.having beenC.to have been given D.having been robbed主要求解释. by the time you arrive this evening,_______ for two hours.a i will study bi willhave been studiedc i had studied d iwill have been studying 英语翻译我学了3年英语.I have been study for three years,快打给多财富 I have been ____ a chance to study in Italy,and I have decided to accept it.A.offered B.supplied C.offering D.providedplease explain