YOU SAID:

It has been raining a lot over the last few days

INTO JAPANESE

ここ数日でたくさん雨が降っています。

BACK INTO ENGLISH

It has been raining a lot since last few days.

INTO JAPANESE

ここ数日からずっと雨が降っています。

BACK INTO ENGLISH

It has been raining since last few days.

INTO JAPANESE

ここ数日から雨が降っています。

BACK INTO ENGLISH

It has been raining since last few days.