不必说更不必说 用英文怎么说啊还有“重视”怎么说啊?

不必说...更不必说...是一起用的吗?不过一起用汉语也不通顺呀,你是不是表达”我工作都可能作不完,更别说去买菜了”这个意思?
这样可以用let alone 连接或者not to mention
I can't even finish my job,let alone bought the food.
let alone bought the food 是虚拟时态． not to mention 后经常接名词
如果是分开的意思
不必说 needless to say
更不必说 let alone/not to mention