once, as soon as
两者均为从属连词,引导时间状语从句,都表示主句的动作紧跟在从句的动作之后发生。
once: 除表时间外,还表示条件,一般译作“一旦......就......”。
- once he makes up his mind,he’ll never give it up.
他一旦下定决心,就决不会放弃(本句不可用as soon as)。
as soon as: 强调的只是时间,译作“刚......就......”或“一......就......”。
- as soon as i get to beijing,i’ll write to you.
我一到北京就写信给你。