as good 和 as good as有什么区别

正规的来说只有 as good as,没有单独用 as good
但是口语里面都很常出现.
差别嘛.直接举例说明吧!
as...as...是一个固定的模式,用来比较东西：
as good as XXX = 像 XXX 一样好
as white as snow = 像雪一样白
as blue as the sky 像天空一样蓝
his face was as pale as a piece of paper = 他的脸苍白得像张纸一样
Mike is as tall as George.= Mike 和 George 一样高
as good (比较不正式,写文章的话不要用!)：
I like Mke,but Tom is just as good.
我喜欢Mike,但是Tom 也一样好.
Why don't you choose this one?It's just as good!
你为什麼不选这一个?(这个) 也一样好阿!
→ 单用as good 之所以不正式就是因为它明明是个比较 ("一样") 却没有说是跟什麼东西比较 ("一样好" 是跟什麼东西一样好?)
(本人热爱英文,欢迎更多的问题 ( )

as good as 和。。。。几乎一样

在以上的回答上再补充一点，as good as 还有“实际上等于”的意思