这句话有错误吗?Would you let us go early if we finish our work?

let's early go out to play if we'll have been finished each other work.按你的套路一点都不口语.口语点：let's go out to play after finish work.
疯了,你非得套用if从句?还主将从现.既然would you了 为啥let?外国人有逻辑概念,既然go early就得有目标……所以错的一塌糊涂,没法改.