以前很经常。 用英文怎么说？

Usually in the past

I used to do...

quite often in the past

used to+V(原形) 过去常常做...
used to doing 习惯于...
used to be 过去是...

used to be

像以前一样经常：as often as before

我至今还保存着你的信，你以前经常用一支粉色的笔写信给我：I still have your letters,you used a pink pen to write them