as soon as 是 “一.就”的意思.时态的话,没什么限制
call me as soon as you arrive.
he went to library as soon as he ate breakfast.
i will write to you as soon as i settle.
as long as 的意思,只要.表示条件.还有 和什么一样长的意思.做只要的意思解的话：
i will forgive you as long as you didn't tell lies.
as long as you can wait,i will work it out.