4、进行时2将来时19beableto(+v原)=can(+v原)能够…eg:Sheisabletosing.Shecansing.补:baseon以…为根据20beabletodosth 能够干什么 eg:sheisabletosing 21beafraidtodo(ofsth 恐惧,害怕…… eg:I'mafraedtogooutatnight I'mafraidofdog22beallowedtodo 被允许做什么 eg: I'm allowed to watch TV 我被允许看电视I should be allowed to watch TV 我应该被允许看电视2