go ahead和go forward的区别.\(≥▽≤)/~无限感激

go ahead指先做/先去/先走 等 （多用在“不用等我”的情况）
go ahead and start the engine先去把引擎给开了
go ahead and sleep先去睡吧
go ahead first,I'll follow you later你先去,我跟着就来
go forward指向前走
go forward and turn left on the second juction向前直走,第二个路口转左
go forward until you see a bank向前直走,直到见到银行

go ahead是前面走的意思，强调在前面。
go forward是向前走的意思，强调向前。

go ahead=先走，
go forward=向前走