when和as soon as在时间状语从句的区别？ 5
答：你说的情况的确是这样的。He felt tired when/ as soon as he came back home.这个英语句子用when或者as soon as连接时，翻译成中文的好像区别不是很大的。不过，when和as soon as引导时间状语从句时还是有点区别的。
连词when是“当......时候( at/during the time that)”的意思，引导的从句的谓语动词可以是延续性的动词，可以是短暂性动词。动作可以是同时发生,也可以是先后发生。而且when有时含有“就在那时（just then; just at that time/ moment）”的意思。例如：
She was playing the piano when someone knocked at the door. (先后发生, 短暂性动词)
当有人在敲门的时候,她正在弹钢琴。
My father was reading a newspaper when I was doing my homework. (同时发生,延续性动词)
当我在做作业时,我的父亲在看报纸。
When I lived in the countryside, I used to go fishing. 当我住在乡下时，我常常去钓鱼。
We were about to leave when he came in. 我们就要离开时，就在那时他进来了。
连接词组as soon as是“一 ......就......“( not later than when; the moment/ minute/ second that)的意思。
as soon as引导的时间状语从句，如果是谈论现在的情况，其时态一般遵循主将从现的原则(即：若主句为一般将来时，从句常用一般现在时表示将来意义）。若主句不是一般将来时，那么从句的时态就要根据上下文的语境来决定。例如：
I'll come to see you as soon as I arrive there. 我一到那儿就来看你。
He got married as soon as he left the university. 他大学一毕业就结了婚。
I will tell him the good news as soon as he comes back. 他一回来，我就会把这个好消息告诉他的。
I am going to watch TV as soon as I finish/ have finished my homework.
When I got home, he was having supper.我到家时，他正在吃饭。
When I was young, I liked dancing.我年轻时喜欢跳舞。 as soon as 引导时间状语从句，表示“一……就……”。如果主句用将来时或情态动词或祈使句，从句必须用一般现在时代替将来时。如：
I’ll tell him the news as soon as he comes.
他一来我就告诉他那消息。
She may come as soon as she finishes the work.
事情一做完她就可以来。
as soon as侧在…什么之间，起强调在…之间的时间段to do smth.
