as folks say
俗にいう
As for our children, they are doing well at school.
うちの子どもたちはといえば,学校でうまくやっている
as from today
本日より
as good as new
新品同様
As he learned, so did he teach.
彼は教えられたとおりに教えた
As he often lies, I can't believe him.
よくうそをつくので彼を信じられない
As I dropped down the hill my spirits rose.
丘を下っていくにしたがって気持ちが上向いた
as I know [learn] to my cost
苦い経験で知っていることだが
as I mentioned before=as (was) mentioned before
前に申し上げたとおり
as I recall
確か,私の記憶では