4、beableto(+v原)=can(+v原) 能够…… eg: Sheisabletosing Shecansing 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